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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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Anonymous Carolina Castillo2
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2 months ago
1) SEE FIRST PHOTO ATTACHED

2) SEE SECOND PHOTO ATTACHED

3) In tomatoes, red fruit (R) is dominant over yellow fruit (r).

Red tomato plants were cross pollinated with yellow tomato plants.  The next generation of plants produced no yellow fruit.

Which of the following rows identifies the genotype and the phenotype of the parental red tomato plants respectively? 

a. red; Rr

b. red; RR

c. Rr; red

d. RR; red



4) In Manx cats, the recessive allele for tail length is lethal. A heterozygous dominant genotype results in a shortened tail, while a homozygous dominant genotype results in a normal tail. A homozygous recessive genotype is lethal.

Which of the following rows correctly identifies the phenotypic ratio of the offspring that results from crossing two shortened tail Manx cats?

a.  Normal           Short Tail           Lethal
           2                        1                        1

b. Normal           Short Tail            Lethal
        2                            1                        0

c.  Normal            Short Tail           Lethal
          0                       2                           1

d. Normal              Short Tail          Lethal
         1                             2                      1



5) SEE PHOTO ATTACHED TO ANSWER ALLOWED

An ear of corn can have kernels that are either purple or yellow in color. Each corn kernel is an individual seed, so an ear of corn contains hundreds of seeds. As a result, an ear of corn can have just purple, purple and yellow, or just yellow seeds.

The allele P (purple) is dominant over the recessive allele p (yellow). If two heterozygous plants are crossed, record the number of each of the possible genotypes.

Answer          Answer              Answer
   PP                    Pp                       pp




6) In garden pea plants, tall stem length (T) is dominant over short stem length (t). A pure breeding tall stem plant was crossed with a short stem plant.

                   T                                 T
t          Genotype 1            Genotype 2

t          Genotype 3             Genotype 4


From the F1 generation, Genotype 3 and Genotype 4 were crossed. What is the frequency of the dominant phenotype in the F2 generation?

Record your answer as a value between 0 and 1, with two significant digits.





7) In cattle, a polled or hornless trait (P) is dominant over a horned trait(p).

A polled bull mated with three different cows, and the following calves were born in the spring.

Cow Phenotype                    F1 Generation Phenotype
Cow 1 - Horned                               Calf 1 - Horned

Cow 2 - Polled                                 Calf 2 - Horned

Cow 3 - Polled                                 Calf 3 - Polled

Which of the following rows correctly identifies the genotypes of the cattle?

a. Cow 3 - Pp                     Calf 3 - pp

b. Cow 1 - pp                        Bull - PP

c. Cow 2 - pp                        Calf 1 - Pp

d. Bull - Pp                         Calf 2 - pp





8) Which of the above cattle genotypes cannot be determined?

a. Cow 3 and Calf 3

b. Cow 2, Cow 3, and Calf 3

c. None

d. Bull, Cow 2, Cow 3, and Calf 3



9) Gregor Mendel determined a way to identify whether an organism with a dominant phenotype was heterozygous or homozygous. In a test cross, the organism with the (DOMINANT / RECESSIVE) phenotype is crossed with an organism that is homozygous (DOMINANT / RECESSIVE)



10) In mice, black fur (B) is dominant over white fur (b).

Which of the following is not the correct method to determine if a mouse with a dominant phenotype has a homozygous or heterozygous genotype?


a. Test crosses need to be conducted on a mouse with a dominant phenotype to determine their genotype.

b. A mouse with a dominant phenotype should be crossed with a mouse with a recessive phenotype.

c. The black mouse should mate with white mice.

d. A mouse with a dominant phenotype should be crossed with any true breeding mouse.




11) Which of the following statements incorrectly illustrates incomplete dominance?

a. Dark brown fur crossed with white fur produces yellow fur.

b. Red flowers crossed with white flowers produce pink flowers

c. Tall plants crossed with short plants produce medium height plants.

d. A black horse crossed with a white horse produces a mixture of white and black hair in a horse.



12) Which of the following statements illustrates codominance?

a. Red flowers crossed with white flowers produce pink flowers.

b. Grey heterozygous chickens have black and white feathers.

c. Two parents with blood types A and B can have children with blood type O.

d. Individuals who are heterozygous for the sickle cell anemia allele are more resistant to malaria.



13) A pure breeding yellow bird is mated with a pure breeding blue bird. There is a lack of dominance in feather colours and all offspring are green feathered.

What are the correct genotypes of a green bird, yellow bird, and blue bird, respectively?

a. By, yy and BB

b. Yb, YY and bb

c. Bb, bb and BB

d. BY, YY, and BB
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Anonymousbio_man
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#1
2 months ago
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4) In Manx cats, the recessive allele for tail length is lethal. A heterozygous dominant genotype results in a shortened tail, while a homozygous dominant genotype results in a normal tail. A homozygous recessive genotype is lethal.

Which of the following rows correctly identifies the phenotypic ratio of the offspring that results from crossing two shortened tail Manx cats?

a.  Normal           Short Tail           Lethal
           2                        1                        1

b. Normal           Short Tail            Lethal
        2                            1                        0

c.  Normal            Short Tail           Lethal
          0                       2                           1

d. Normal              Short Tail          Lethal
         1                             2                      1

5) SEE PHOTO ATTACHED TO ANSWER ALLOWED

An ear of corn can have kernels that are either purple or yellow in color. Each corn kernel is an individual seed, so an ear of corn contains hundreds of seeds. As a result, an ear of corn can have just purple, purple and yellow, or just yellow seeds.

The allele P (purple) is dominant over the recessive allele p (yellow). If two heterozygous plants are crossed, record the number of each of the possible genotypes.

Answer          Answer              Answer
   PP                    Pp                       pp

the genotype of heterozygous purple kernels = Pp

Now Pp x Pp

Gametes ---> P p P p

Offsprings ---->

P   p
P   PP   Pp
p   Pp   pp
therefore the expected number of PP genotype = 1

expected number of Pp genotype = 2

expected number of pp genotype = 1

Quote
6) In garden pea plants, tall stem length (T) is dominant over short stem length (t). A pure breeding tall stem plant was crossed with a short stem plant.

                   T                                 T
t          Genotype 1            Genotype 2

t          Genotype 3             Genotype 4


From the F1 generation, Genotype 3 and Genotype 4 were crossed. What is the frequency of the dominant phenotype in the F2 generation?

Record your answer as a value between 0 and 1, with two significant digits.



Quote
In cattle, a polled or hornless trait (P) is dominant over a horned trait(p).

A polled bull mated with three different cows, and the following calves were born in the spring.

Cow Phenotype                    F1 Generation Phenotype
Cow 1 - Horned                               Calf 1 - Horned

Cow 2 - Polled                                 Calf 2 - Horned

Cow 3 - Polled                                 Calf 3 - Polled

Which of the following rows correctly identifies the genotypes of the cattle?

a. Cow 3 - Pp                     Calf 3 - pp

b. Cow 1 - pp                        Bull - PP

c. Cow 2 - pp                        Calf 1 - Pp

d. Bull - Pp                         Calf 2 - pp

Bull : Pp and Calf 2 : pp

Explanation :

As per the given information, the allele responsible for hornless cattle (P) is dominant over the allele responsible for horned cattle (p). It means that the allelic combination PP and Pp will result in hornless cattle while the allelic combination pp will result in horned cattle.

As per the available options, if the allelic combination of both bull and Cow 2 will be Pp, then they will result in calf with allelic combinations PP, Pp and pp. Among these the calf having PP and Pp will be hornless while pp will be horned.
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Anonymous
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#2
2 months ago
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