What are the genotypes of the two parents?

Question

Blue teeth (B) is completely dominant to white teeth (b) .

Green spotted skin (G) is completely dominant to pink spotted skin(g).

Dark toe nails (D) is completely dominant to light colored toe tails (d).

A male with Blue teeth, pink spotted skin and Dark toe nails mates with a female that has Blue teeth, pink spotted skin and Dark toe nails.

They have 2 offspring

Their first child has white teeth and dark toe nails.

Their second child has Blue teeth and light colored toe nails.

1. What are the genotypes of the two parents?

2. What gametes are produced by these parents?

3. Using a punnet square, calculate genotype ratio for all possible offspring.

4. What is the phenotype ratio of the possible offspring

Answer 1

Bb

Dd

Gg

For both parents

Answer 2

HI!!!

GENOTYPES OF PARENTS:

MALE:Bb

           gg

            Dd

FEMALE:Bb

                 gg

                  Dd

GAMETES PRODUCED BY BOTH PARENTS:

MALE GAMETES:

1-BgD         2-BgD     3- gDb     4-gdb.

FEMALE GAMETES:

1-BgD     2-BgD    3-gDb      4-gdb

PUNNET SQUARE

They can produce 16 offspring with genotypes as follows

1-BBggDD                  2-BBggDD             3-BbggDD

4-BbggDd                   5-BBggDD             6-BBggDD

7-BbggDD                8-BbggDd               9-BbggDD

10-BbDDgg               11-DDbbgg           12-Ddbbgg

13-BbDdgg               14-BbggDd            15-Ddbbgg

16-bbddgg.

PHENOTYPE RATIO:

Im not sure about it,but i think its 75% by 25%.

Answer 3

Male: Blue teeth, pink skin and dark toe nails

Female: Blue teeth, pink skin and dark toe nails

Kid 1: White teeth, dark toe nails

Kid 2: Blue teeth, light toe nails

1- Because both parents have pink skin (g) and g is a recessive gene, we know that their genotype of skin color is gg.

Because kid 1 has white teeth and w is a recessive gene, both parents have to be heterozygous for teeth color and therefore their genotype has to be Bb.

Because kid 2 has light color and d is a recessive gene, both parents have to be heterozygous for toe nail color and therefore their genotype has to be Dd.

Male genotype: BbggDd

Female genotype: BbggDd

2- Gametes produced by each parent: BgD, Bgd, bgD or bgd.

3, 4- you should be able to answer these 2 questions with the information I gave.

Answer 4

1. male: Bb gg  Dd

   female: Bb gg Dd

2. ?

3.?

4.?

sorry i couldn't help more