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wrote...
Posts: 6
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2 months ago Edited: 2 months ago, dal9473
1. Select only the true statements. This is a right minus wrong question so be
very careful.
A. A normal human body cell karyotype contains a total of 23 chromosomes.
B. Meiosis II is basically a mitotic-type division.
C. A very large cross-over rate between two linked genes indicates that they are located far apart on their chromosome.
D. Meiosis I is a form of reduction division.
E. A Punnett square is able to predict exactly the number of offspring of each genotype that will be produced by a cross.

2. Explain completely, with examples, the difference between this pair of words:
allele - trait

3. When two bell-shaped squash plants are crossed, 25% ofthe offspring
are round, 25% are long, and 50% are bell-shaped. This cross BEST
illustrates
A. a test cross
B. complete dominance
C. multiple alleles
D. incomplete dominance


4. If one begins with one cell and follows it through three mitotic divisions, the end of the process will be how many cells?
A. 16
B. 32
c. 8
D. 4
 

5. If2n = 20 chromosomes in corn, then the mature egg of a com plant has a chromosome number of
A.  20
B.  10
c.  40
D.  5
Post Merge: 2 months ago

anyone interested in answering these?
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5 Replies
Replies
wrote...
Educator
2 months ago Edited: 2 months ago, bio_man
1. Select only the true statements. This is a right minus wrong question so be very careful. A. A normal human body cell karyotype contains a total of 23 chromosomes. B. Meiosis II is basically a mitotic-type division. C. A very large cross-over rate between two linked genes indicates that they are located far apart on their chromosome. D. Meiosis I is a form of reduction division. E. A Punnett square is able to predict exactly the number of offspring of each genotype that will be produced by a cross.

A. A normal human body cell karyotype contains a total of 23 chromosomes. -- T
B. Meiosis II is basically a mitotic-type division. -- T
C. A very large cross-over rate between two linked genes indicates that they are located far apart on their chromosome. -- A direct consequence of this randomness is that the farther apart two linked loci are from each, the more likely it is that a crossover event will occur somewhere within the length of chromosome that lies between them.
D. Meiosis I is a form of reduction division. -- T
E. A Punnett square is able to predict exactly the number of offspring of each genotype that will be produced by a cross. -- T

2. Explain completely, with examples, the difference between this pair of words: allele - trait

Alleles are different versions of a gene. Take for example hairline -- two main alleles for the hairline gene: straight and pointed. Trait is a specific characteristic of an individual. Hairline is a trait that ALL humans possess. Traits are determined by genes, and also they are determined by the interaction with the environment with genes.

** Keep in mind, a maximum of 2 questions per thread, ideally 1 per topic.
The best way to say thank you is with a positive review:

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wrote...
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2 months ago
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Quote
3. When two bell-shaped squash plants are crossed, 25% ofthe offspringare round, 25% are long, and 50% are bell-shaped. This cross BESTillustratesA. a test crossB. complete dominanceC. multiple allelesD. incomplete dominance

There are three phenotypes here, long, round, and bell-shaped. This suggests there's incomplete dominance, so a mixing of phenotypes. If we say Hh is bell-shaped, HH is round, and hh is long, crossing 2 heterozygous plants gives you:

……H h
H  HH Hh
h  Hh hh

Incomplete dominance and codominance are types of inheritance of traits where both alleles are neither dominant nor recessive.

Quote
If one begins with one cell and follows it through three mitotic divisions, the end of the process will be how many cells?

Are the daughter cells also undergoing mitosis?!? If not, here's what'll happen:

InitialO
1stOO
2ndOOO
3rdOOOO

Answer should be 4. HOWEVER, if the daughter cells also undergo mitosis, the answer will be different:

InitialO
1stOO
2ndOOOO
3rdOOOOOOOO

Would be 8. So it's up to your interpretation, may want to ask your professor.

Quote
If2n = 20 chromosomes in corn, then the mature egg of a com plant has a chromosome number of

n = 10

✌️
This verified answer contains over 530 words.
1
- Master of Science in Biology
- Bachelor of Science (Biology)
- Bachelor of Education
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wrote...
Educator
2 months ago
Thanks, Duddy!
The best way to say thank you is with a positive review:

  https://trustpilot.com/review/biology-forums.com 

Your support goes a long way!


Make a note request here
wrote...
Staff Member
2 months ago
We.coome, I know you wrote 2 questions per thread but I couldn't resist lol
- Master of Science in Biology
- Bachelor of Science (Biology)
- Bachelor of Education
wrote...
2 months ago
Sorry bout asking more questions than allowed.  Thankyou very much both of you for answering these for me.
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