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Anonymous Carolina Castillo2
wrote...
2 months ago
1) In guinea pigs, a black coat (B) is dominant over a white coat (b), and straight hair (S) is dominant over curly hair (s). A heterozygous, black, and straight hair guinea pig (BbSs) was test crossed.


A) Which of the following rows identifies pure breeding guinea pigs for both hair colour and hair type?

a.      Genotype 1               Genotype 2
             bbSs                            BbSS

b.     Genotype 1                Genotype 2
            BBSS                              BbSs

c.    Genotype 1                 Genotype 2   
            BbSS                            BBSs

d.     Genotype 1               Genotype 2
           bbSS                             BBss



B) Which of the following genotypes would produce a population in which 50% of the offspring would have a black coat and all of the offspring would have curly hair?


a. Bbss and BbSs


b. bbSS and bbSs


c. Bbss and bbss


d. BBSS and bbss



c) A guinea pig heterozygous for both traits mated with a homozygous recessive guinea pig. What is the probability of having offspring with at least one dominant trait?

a. 0.50

b. 0.75

c. 0.00

d. 0.25

e. 1.0







2) Use the following information to answer the next two questions.

In mice, black fur (W) is dominant over white fur (w), and black eyes are dominant (R) over red eyes (r).

A male mouse with black fur and black eyes mated with a female mouse with white fur and red eyes. Out of 64 offspring, 30 had black fur and black eyes, and 34 had white fur and black eyes.

A) What is the genotype of the male parental mouse?
a. WWRR

b. WwRR

c. WWRr

d. WwRr



B) A male mouse heterozygous for both fur and eye colour mated with a female mouse heterozygous for both traits.

Out of 64 offspring, how many mice can be expected to be heterozygous for both fur and eye colour?

a. 12

b. 4

c. 36

d. 48

e. 16

f. 1







3) All Vulcans have pointed ears (P) and a right-sided heart (R) which are dominant over Earthling alleles of rounded ears (p) and a left-sided heart (r). Both Vulcans and Earthlings are homozygous for each allele.

Mr. Spock has a Vulcan father and an Earthling mother.

Which of the following is true about Mr. Spock’s genotype in relation to the genes for ear shape and heart sidedness?

a. Ear Shape                Heart Sidedness
Homozygous          Homozygous

b. Ear Shape   Heart Sidedness
Heterozygous   Homozygous

c. Ear Shape              Heart Sidedness
Heterozygous        Heterozygous

d. Ear Shape   Heart Sidedness
Homozygous   Heterozygous




4) Which of the following scenarios best describes an epistatic gene?

a. Fur pattern is controlled by two genes such that one gene inhibits the expression of the other gene.

b. Mouse fur colours are expressed as a blend of the dominant black colour and the recessive white colour, resulting in a heterozygous brown colour.

c. Individuals with sickle cell anemia and carriers of the sickle cell allele have some resistance to malaria.

d. Chicken combs follow a dominance hierarchy whereby a walnut comb is the most dominant and a single comb is the least dominant.







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Answer verified by a subject expert
Anonymousbio_man
wrote...
1 months ago
Sign in or Sign up in seconds to unlock everything for free
) In guinea pigs, a black coat (B) is dominant over a white coat (b), and straight hair (S) is dominant over curly hair (s). A heterozygous, black, and straight hair guinea pig (BbSs) was test crossed.


A) Which of the following rows identifies pure breeding guinea pigs for both hair colour and hair type?

a.      Genotype 1               Genotype 2
             bbSs                            BbSS

b.     Genotype 1                Genotype 2
            BBSS                              BbSs

c.    Genotype 1                 Genotype 2   
            BbSS                            BBSs

######d.     Genotype 1               Genotype 2
           bbSS                             BBss



B) Which of the following genotypes would produce a population in which 50% of the offspring would have a black coat and all of the offspring would have curly hair?


a. Bbss and BbSs


b. bbSS and bbSs


##########c. Bbss and bbss


d. BBSS and bbss



c) A guinea pig heterozygous for both traits mated with a homozygous recessive guinea pig. What is the probability of having offspring with at least one dominant trait?

a. 0.50

b. 0.75

c. 0.00

##########d. 0.25

e. 1.0







2) Use the following information to answer the next two questions.

In mice, black fur (W) is dominant over white fur (w), and black eyes are dominant (R) over red eyes (r).

A male mouse with black fur and black eyes mated with a female mouse with white fur and red eyes. Out of 64 offspring, 30 had black fur and black eyes, and 34 had white fur and black eyes.

A) What is the genotype of the male parental mouse?
a. WWRR

#######b. WwRR

c. WWRr

d. WwRr



B) A male mouse heterozygous for both fur and eye colour mated with a female mouse heterozygous for both traits.

Out of 64 offspring, how many mice can be expected to be heterozygous for both fur and eye colour?

a. 12

b. 4

c. 36

d. 48

##########e. 16

f. 1







3) All Vulcans have pointed ears (P) and a right-sided heart (R) which are dominant over Earthling alleles of rounded ears (p) and a left-sided heart (r). Both Vulcans and Earthlings are homozygous for each allele.

Mr. Spock has a Vulcan father and an Earthling mother.

Which of the following is true about Mr. Spock’s genotype in relation to the genes for ear shape and heart sidedness?

a. Ear Shape                Heart Sidedness
Homozygous          Homozygous

b. Ear Shape   Heart Sidedness
Heterozygous   Homozygous

######c. Ear Shape              Heart Sidedness
Heterozygous        Heterozygous

d. Ear Shape   Heart Sidedness
Homozygous   Heterozygous




4) Which of the following scenarios best describes an epistatic gene?

########a. Fur pattern is controlled by two genes such that one gene inhibits the expression of the other gene.

b. Mouse fur colours are expressed as a blend of the dominant black colour and the recessive white colour, resulting in a heterozygous brown colour.

c. Individuals with sickle cell anemia and carriers of the sickle cell allele have some resistance to malaria.

d. Chicken combs follow a dominance hierarchy whereby a walnut comb is the most dominant and a single comb is the least dominant.
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