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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
Embryology, epigenetics, prenatal development, etc.
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In grape cultivation, growers often find that heterozygous forms are more desirable. To propagate ...
In grape cultivation, growers often find that heterozygous forms are more desirable. To propagate ...
In grape cultivation, growers often find that heterozygous forms are more desirable. To propagate the heterozygotes without having to interbreed in each generation, what method can they use?
 
  What will be an ideal response?
19zbell   71   1 Reply
6 years ago
Which part of the T2 bacteriophage entered E. coli cells in the experiment which confirmed the ...
Which part of the T2 bacteriophage entered E. coli cells in the experiment which confirmed the ...
Which part of the T2 bacteriophage entered E. coli cells in the experiment which confirmed the identity of the transforming principle?
 
  A) The RNA
  B) The DNA
  C) The whole virus
  D) The protein coat
  E) No part
19zbell   66   1 Reply
6 years ago
If a gene is replaced with a heterologous sequence such that the gene is then nonfunctional, what is ...
If a gene is replaced with a heterologous sequence such that the gene is then nonfunctional, what is ...
If a gene is replaced with a heterologous sequence such that the gene is then nonfunctional, what is the result usually called?
 
  What will be an ideal response?
19zbell   79   1 Reply
6 years ago
Given the DNA oligonucleotide 5'-AGTCTAGGCT-3', reconstruct a sequencing gel based on dideoxy ...
Given the DNA oligonucleotide 5'-AGTCTAGGCT-3', reconstruct a sequencing gel based on dideoxy ...
Given the DNA oligonucleotide 5'-AGTCTAGGCT-3', reconstruct a sequencing gel based on dideoxy sequencing, showing the relative position of each DNA fragment (band) on the gel.
 
  What will be an ideal response?
19zbell   45   1 Reply
6 years ago
Which type of mutation is possible thanks to the redundant nature of the genetic code?
Which type of mutation is possible thanks to the redundant nature of the genetic code?
Which type of mutation is possible thanks to the redundant nature of the genetic code?
 
  A) silent
  B) missense
  C) nonsense
  D) frameshift
  E) splice site
19zbell   67   2 Replies
6 years ago
What is meant by the beads on a string model of chromatin?
What is meant by the beads on a string model of chromatin?
What is meant by the beads on a string model of chromatin?
 
  A) The beads are the histones, and the string is the transcriptionally active DNA loops.
  B) The beads are the nucleosomes, and the string is the linker DNA.
  C) Th
19zbell   63   1 Reply
6 years ago
The number of linkage groups in an organism with sex chromosomes equals:
The number of linkage groups in an organism with sex chromosomes equals:
The number of linkage groups in an organism with sex chromosomes equals:
 
  A. 1n
  B. 2n +1
  C. 1n + 1
 
  D. 2n + 2
19zbell   50   1 Reply
6 years ago
Mutations are the only source of genetic variation in a population. (True or false?)
Mutations are the only source of genetic variation in a population. (True or false?)
Mutations are the only source of genetic variation in a population.
 
  Indicate whether the statement is true or false
19zbell   62   1 Reply
6 years ago
After screening a colony of bacteria for mutations in a given gene, you discover 100 mutant colonies ...
After screening a colony of bacteria for mutations in a given gene, you discover 100 mutant colonies ...
After screening a colony of bacteria for mutations in a given gene, you discover 100 mutant colonies out of 3 million total colonies. What is the mutation frequency for this gene in the population?
 
  A. 1.0 x 105
  B. 1.0 x 10-5
19zbell   47   2 Replies
6 years ago
In the experiment performed by Lederberg and Tatum bacteria of different genotypes had to be mixed ...
In the experiment performed by Lederberg and Tatum bacteria of different genotypes had to be mixed ...
In the experiment performed by Lederberg and Tatum bacteria of different genotypes had to be mixed together to obtain genetic transfer.
 
  However, Davis performed the experiment in a slightly different manner by separating cells with a f
19zbell   43   1 Reply
6 years ago
A cell with an F factor integrated into the bacterial chromosome is called __________.
A cell with an F factor integrated into the bacterial chromosome is called __________.
A cell with an F factor integrated into the bacterial chromosome is called __________.
 
  A. Hfr
  B. F+
  C. Conjugative plasmid
19zbell   63   1 Reply
6 years ago
A vector is a small segment of DNA that a gene of interest is inserted into for cloning. (True or false?)
A vector is a small segment of DNA that a gene of interest is inserted into for cloning. (True or false?)
A vector is a small segment of DNA that a gene of interest is inserted into for cloning.
 
  Indicate whether the statement is true or false
19zbell   84   1 Reply
6 years ago
If a light-eosin eye male Drosophila is crossed to a homozygous red eyed female, what will be the ...
If a light-eosin eye male Drosophila is crossed to a homozygous red eyed female, what will be the ...
If a light-eosin eye male Drosophila is crossed to a homozygous red eyed female, what will be the phenotype of their offspring?
 
  A. All offspring will have red eyes
  B. All males will have light-eosin eyes and all females will hav
19zbell   74   1 Reply
6 years ago
DNA polymerase III has the ability to begin synthesis of the new daughter strands immediately ...
DNA polymerase III has the ability to begin synthesis of the new daughter strands immediately ...
DNA polymerase III has the ability to begin synthesis of the new daughter strands immediately following the formation of the replication fork.
 
  Indicate whether the statement is true or false
19zbell   44   1 Reply
6 years ago
Incomplete dominance is an example of blending of phenotypes, not genotypes. (True or false?)
Incomplete dominance is an example of blending of phenotypes, not genotypes. (True or false?)
Incomplete dominance is an example of blending of phenotypes, not genotypes.
 
  Indicate whether the statement is true or false
19zbell   45   1 Reply
6 years ago
DNA helicase enzymes move in what direction along the DNA during DNA replication?
DNA helicase enzymes move in what direction along the DNA during DNA replication?
DNA helicase enzymes move in what direction along the DNA during DNA replication?
 
  A. 5' to 3'
  B. 3' to 5'
  C. They remain stationary
19zbell   32   1 Reply
6 years ago
A population that is homozygous for a given allele is called polymorphic. (True or false?)
A population that is homozygous for a given allele is called polymorphic. (True or false?)
A population that is homozygous for a given allele is called polymorphic.
 
  Indicate whether the statement is true or false
19zbell   46   1 Reply
6 years ago
Where does the process of transcription initiate?
Where does the process of transcription initiate?
Where does the process of transcription initiate?
 
  A. Promoter
  B. Terminator
  C. Regulation sequences
  D. Transcription factors
19zbell   57   2 Replies
6 years ago
If the gametes of an organism are different morphologically, they are said to be __________.
If the gametes of an organism are different morphologically, they are said to be __________.
If the gametes of an organism are different morphologically, they are said to be __________.
 
  A. isogamous
  B. heterogamous
  C. diploid
  D. haploid
19zbell   33   2 Replies
6 years ago
What piece of the RNA HIV genome is used as a primer during the synthesis of double-stranded DNA ...
What piece of the RNA HIV genome is used as a primer during the synthesis of double-stranded DNA ...
What piece of the RNA HIV genome is used as a primer during the synthesis of double-stranded DNA from HIV RNA?
 
  A. tRNA
  B. U3
  C. gag
 
  D. PPT
19zbell   31   1 Reply
6 years ago
What was the conclusion of the Hershey-Chase experiments?
What was the conclusion of the Hershey-Chase experiments?
What was the conclusion of the Hershey-Chase experiments?
 
  A. Their results suggested the presence of a transforming principle.
  B. Their results suggested that DNA is a double helix
  C. Their results suggested that A+G=T+C
19zbell   61   1 Reply
6 years ago
The _____ value indicates the probability that differences between the observed values and the ...
The _____ value indicates the probability that differences between the observed values and the ...
The _____ value indicates the probability that differences between the observed values and the expected values are due to random chance alone.
 
  A. P value
  B. Goodness of fit
  C. Degrees of freedom
  D. Empirical approa
19zbell   28   1 Reply
6 years ago
__________ is a foot deformity characterized by the inward turning of the foot at the ankle with the ...
__________ is a foot deformity characterized by the inward turning of the foot at the ankle with the ...
__________ is a foot deformity characterized by the inward turning of the foot at the ankle with the toe fixed in a tiptoe position.
 
  Fill in the blank(s) with correct word
19zbell   197   2 Replies
6 years ago
Chest x-ray is the best way to detect a pulmonary embolism (True or false?)
Chest x-ray is the best way to detect a pulmonary embolism (True or false?)
Chest x-ray is the best way to detect a pulmonary embolism.
 
  Indicate whether the statement is true or false
19zbell   36   1 Reply
6 years ago
Chronic thyroiditis is caused by an autoimmune-mediated destruction of the thyroid gland. ...
Chronic thyroiditis is caused by an autoimmune-mediated destruction of the thyroid gland. ...
Chronic thyroiditis is caused by an autoimmune-mediated destruction of the thyroid gland.
 
  Indicate whether the statement is true or false
19zbell   73   1 Reply
6 years ago
What factors increase a woman's risk of breast carcinoma?
What factors increase a woman's risk of breast carcinoma?
What factors increase a woman's risk of breast carcinoma?
 
  What will be an ideal response?
19zbell   47   1 Reply
6 years ago
Long-term treatment of postmenopausal patients with estrogen and progestin increases the risk of ...
Long-term treatment of postmenopausal patients with estrogen and progestin increases the risk of ...
Long-term treatment of postmenopausal patients with estrogen and progestin increases the risk of breast carcinoma.
 
  Indicate whether the statement is true or false
19zbell   38   2 Replies
6 years ago
If alveolar PCO2 falls as a result of hyperventilation, which of the following events is likely to ...
If alveolar PCO2 falls as a result of hyperventilation, which of the following events is likely to ...
If alveolar PCO2 falls as a result of hyperventilation, which of the following events is likely to occur?
 
  A. Blood PCO2 and carbonic acid both fall.
  B. Blood PCO2 falls and carbonic acid rises.
  C. Both blood PCO2 and carb
19zbell   63   1 Reply
6 years ago
Which of the following conditions is NOT involved in the pathogenesis of emphysema?
Which of the following conditions is NOT involved in the pathogenesis of emphysema?
Which of the following conditions is NOT involved in the pathogenesis of emphysema?
 
  A. Cigarette smoking
  B. Atmospheric air pollution
  C. Pipe and cigar smoking
  D. Use of chewing tobacco and/or snuff
19zbell   35   1 Reply
6 years ago
A 1-week-old female is brought to her pediatrician for abdominal distention and unstable ...
A 1-week-old female is brought to her pediatrician for abdominal distention and unstable ...
A 1-week-old female is brought to her pediatrician for abdominal distention and unstable tem-perature. Physical examination reveals bradycardia and apnea. Tests reveal portal venous gas and an intestinal perforation. This condition is referred to as:
19zbell   31   1 Reply
6 years ago
A sign that a newborn infant may have pyloric stenosis is:
A sign that a newborn infant may have pyloric stenosis is:
A sign that a newborn infant may have pyloric stenosis is:
 
  a. diarrhea.
  b. bile regurgitation.
  c. olive-sized mass in the upper abdomen.
  d. ascites with a fluid wave visible across the abdomen.
19zbell   54   2 Replies
6 years ago
The organism that causes tuberculosis is a:
The organism that causes tuberculosis is a:
The organism that causes tuberculosis is a:
 
  a. bacterium.
  b. fungus.
  c. virus.
  d. parasite.
19zbell   45   2 Replies
6 years ago
Can genetic operation be easily performed
Can genetic operation be easily performed
Can genetic operation be easily performed?
1bigcat   375   1 Reply
9 years ago
Which of the following best describes the sex chromosomes?
Which of the following best describes the sex chromosomes?
[html]Which of the following best describes the sex chromosomes?


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2014Chevy   26   1 Reply
3 years ago
Cross-pollination occurs within a single plant while self-pollination occurs between two plants.
Cross-pollination occurs within a single plant while self-pollination occurs between two plants.
[html]Cross-pollination occurs within a single plant while
2014Chevy   28   1 Reply
3 years ago
Suppose that you are a genetic counsellor, and a man and woman come to you with concerns that if ...
Suppose that you are a genetic counsellor, and a man and woman come to you with concerns that if ...
[html]Suppose that you are a genetic counsellor, and a man and woman come to you with concerns that if they have a child together, it could hav
2014Chevy   49   1 Reply
3 years ago
Which scientist was responsible for the characterization of linked genes?
Which scientist was responsible for the characterization of linked genes?
[html]Which scientist was responsible for the characterization of linked genes?


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2014Chevy   24   1 Reply
3 years ago
What does chromatin consist of?
What does chromatin consist of?
[html]What does chromatin consist of?


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2014Chevy   40   1 Reply
3 years ago
Which of the following determines the rate at which proteins are made?
Which of the following determines the rate at which proteins are made?
[html]Which of the following determines the rate at which proteins are made?


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2014Chevy   67   1 Reply
3 years ago
What are the two major types of chromosomes in many eukaryotic organisms?
What are the two major types of chromosomes in many eukaryotic organisms?
[html]What are the two major types of chromosomes in many eukaryotic organisms?


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3099592   44   1 Reply
3 years ago
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