Each of two parents has the genotype red / blond, which consists of the pair of alleles that determine hair color, and each parent contributes one of those alleles to a child. Assume that if the child has at least one red allele, that color will dominate and the child's hair color will be red.

a. List the different possible outcomes. Assume that these outcomes are equally likely.

b. What is the probability that a child of these parents will have the blond/blond genotype?

c. What is the probability that the child will have red hair color?

For the characteristic hair color, each of two parents are heterozygous with blond and red hair alleles. Assuming that the red hair color is dominant, according to the different possible outcomes, the probability that they have a child with blonde/blond genotype is 25%, while the probability of having children with red hair is 75%.

Explanation:

To perform this exercise it's necessary to build a Punnett chart, corresponding to the crossing of heterozygous parents with red hair. This result will be useful for answering each of the questions.

a. List the different possible outcomes. Assume that these outcomes are equally likely.

The different possible outcomes of crossing two heterozygous individuals can be seen by a Punnett chart.

As the red hair color is dominant will be called "B", while recessive blonde will be "b", each parent's genotype will be Bb

Alleles B b

B BB Bb

b BB bb

The result will be:

50% probability of heterozygous (Bb) descendants with red hair phenotype.
25% probability of children with dominant red-haired homozygous (BB).
25% chance of recessive homozygous offspring of blond hair (bb).

b. What is the probability that a child of these parents will have the blond/blond genotype?

According to Punnett chart, from heterozygous parent crossing to the characteristic hair color, only 25% of offspring has the probability of having the blonde/blonde genotype (bb).

c. What is the probability that the child will have red hair color?

The probability, in this case, of a child having red hair is 75% (50% with Bb genotype and 25% with genotype BB).

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