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Cross a true-breeding black mouse with a yellow mouse.

1/2 of the offspring are black, 1/2 yellow. When you cross two yellow mice you get 2:1 yellow to black. What is this an example of?

A. sex linkage

B. incomplete dominance

C. lethal allele

D. none of the above

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Related questions

In rats, several independently assorting autosomal genes affectcoat color. Gene A controls the distribution of yellowpigment in hair, and gene B causes black pigmentation. Thetwo genes interact as follows: A–B– (gray), A–bb(yellow), aaB– (black), and aabb (cream). Thesegenotypes are only expressed in the presence of the dominant alleleof a third gene, C; rats with genotype cc arealbino.

a. Deduce the genotype of each albino mice, to the extent that ispossible, in the following table. Explain your answers.

True-breeding parents

F1

F2 offspring

Gray x albino-1

All gray

3/4 gray : 1/4 albino

Gray x albino-2

All gray

9/16 gray : 3/16 yellow : 4/16 albino

Part a.

Genotype of albino-1 parent is …

Explanation:

Genotype of albino-2 parent is …

Explanation:

b. Deduce the genotype and phenotype of each parent in the followingtable. Explain your answers.

Parents

Numbers of offspring

Cross 1

135 gray, 83 albino, 47 yellow, 44 black, 16 cream

Cross 2

103 albino, 74 black, 25 cream

Part b.

Parental phenotypes

Parental genotypes

Cross 1

x

x

Explanation:

Part b.

Parental phenotypes

Parental genotypes

Cross 2

x

x

Explanation:

c. A gray-colored rat ismated with one that is yellow. The offspring include an albino ratand a cream-colored rat. Diagram this cross. Be sure to include thePunnett square and the phenotypic ratio in the offspring.

Part c.

Cross is … x

Explanation:

Punnett Square

Fill the punnet sq

Thank you

In a coat-color gene, the dominant allele B codes for brown coat inmice, while the recessive b allele codes for yellow coat. However,when two copies of the B allele are present in an embryo, theindividual dies before birth.

What is the proportion of brown and yellow offspring when a brownmouse mates with a yellow mouse? And What is the proportion ofbrown and yellow offspring when a brown mouse mates with a brownmouse?

Q.In the non-9:3:3:1 ratio dihybrid cross below, there are 3 classes of phenotypes: white, pink, red which of the following is NOT true?

9 A_B_ white

3 A_bb pink

3 aaB_ red

1 aabb red

a.) phenotype is dependent on the genotype of gene B

b.) This is an example of recessive episasis

c.) aa is epistatic to B_, and bb

d.) phenotype is dependent on the genotype of gene A

Q,When choosing a selectable marker, you...

a.) choose a enhancer for your gene of interest

b.) choose a rescue gene to save your gene of interest

c.) choose a resistant gene that will allow for colony screening

d.) choose a gene that encodes for DNA replication

Q.The following steps detail an experiment resulting in transgenic mice with a knockout gene for fur color. Recall that agouti (brown) mice are A/A;M/M and black fur coats are a/a;M/M . List the steps in their correct chronological order.

1.Inject transformed agouti embryotic cells into an a/a;M/M embryo to produce A/A;M/m and a/a;M/M altered embryo

2.Self-cross hemizygous mice to produce homozygous transgenic mice (A/-;M/m)

3.Create a a targeting vector containing tk+ for ganciclovir sensitivity, neoR for neomycin resistance, and the gene encoding fur color.

4.Observe mice with chimeric phenotype and cross them with black a/a;M/M mice to produce transgenic hemizygous progeny (A/a;M/m)

5.Isolate all transformed embryonic stem cells that show homologous recombination and inject them into a embryonic stem cells of an agouti mouse.

a.) 3,5,4,1,2

b.) 1,5,3,4,2

c.) 3,5,1,4,2

d.) 5,3,2,4,2

If dog 1 has is black with alleles (A_B_) , and dog 2 is brown with (aaB_), and dog 3 is yellow with (_ _bb) alleles, what kind of epistasis is this and what color would dog 4 be if he was (AAbb).

1. Recessive epistasis, Yellow

2. Recessive epistasis, Black

3. Dominant epistasis, Yellow

4. Dominant epistasis, Black

A gene interaction in which pair of recessive genes at one locus prevents expression of dominant allele at another locus called

a. incomplete dominance

b. epistatis

c. complete dominance

d. polygenic inheritance

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