1) In genies there is a gene that controls skin color. The allele for blue skin

Question

1) In genies there is a gene that controls skin color. The allele for blue skin is dominant to the allele for pink skin. A blue genie meets a pink genie and it is love at first sight. They get married and start a family. They have a total of 3 baby genies, 2 girls with pink skin and 1 boy with blue skin. Show the Punnet square and resulting genotypic.

a) what is the genotype of the father

b) to solve this problem you need to perform a ______ cross.

c)What type of inheritance is exhibited in this problem?

Explanation / Answer

As per the given problem first we can derive following points:

1. Allele for blue skin is dominant to the allele for pink skin

2. Progenies are 2 girls with pink skin and 1 boy with blue skin

3. The cross is monohybrid because it is between two true-breeding parents that differ in only one characteristic.

Now, as per Punnet square

Punnett Square Approach to a Monohybrid Cross the resulting offspring are monohybrids.

To demonstrate a monohybrid cross, considering the given case of true-breeding genie with blue versus pink genie babies. A Punnett square, devised by the British geneticist Reginald Punnett, can be drawn that applies the rules of probability to predict the possible outcomes of a genetic cross or mating and their expected frequencies. Prepare a Punnett square for all possible combinations of the parental alleles are listed along the top (for one parent) and side (for the other parent) of a grid, representing their meiotic segregation into haploid gametes . Each possibility is equally likely, genotypic ratios can be determined from a Punnett square.

    Traits are shown with a Capital letter for

    dominant and a lower case for recessive

            – Pink Skin (P) Blue (b)

Monohybrid Cross

P                      PP                                bb

                        (Pink)                          (Blue)

Gametes          P(Pink)                        b(Blue)

F1                                     Pb(Pink)    

Gametes          P(Pink)                        b(Blue)

F2                               P                       b

Pink

PP

Pink

Pb

Pink

Pb

Blue

bb

                P

                b

Now the answers are as follows:

a) The genotype of fater is Blue and recessive

b) to solve this problem we have performed Monohybrid cross.

c) Dominant inheritance is exhibited in this problem.

Pink

PP

Pink

Pb

Pink

Pb

Blue

bb

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