The trait for red hair is recessive (r) to the trait for brown hair (R). What is the probability that two parents, one with red hair and one heterozygous for brown hair will have 6 children, 4 with brown hair and 2 with red hair?

Tanya has a family history of colorblindness but can see colors, and her partner Tim is affected by colorblindness. Colorblindness is an X-linked recessive condition with the alleles: XB (unaffected and dominant) and Xb (affected and recessive). Tanya’s mother was affected, but her father was not. Her partner Tim is also affected. What is the probability that if Tanya and Tim had a daughter that she would be affected? How about a Son?

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In the USA the frequency of carriers for the devastating autosomal recessive trait of procrastination is 1/10 people. You do not procrastinate and want to have a child with another highly efficient non-procrastinator. You are worried that you both might be carriers and that your child would be a procrastinator. What is the probability that you are a carrier, AND your mate is a carrier, AND your child is procrastinator?

Brown eye color is dominant to blue eye color. Individual A is heterozygous for brown eyes. Individiual B has brown eyes, and both his parents have brown eyes. Given this information, what is the probability that their baby will have blue eyes?

In humans, the gene for right-handedness is dominant to the gene for left-handedness. A man and a woman both heterozygous for this trait marry. What percent of their children can they expect to be right-handed? What percent left-handed? What are the genotypic and phenotypic ratios?

in earlobes, attached (A) earlobe is dominant while free (f) earlobe is recessive.  - free earlobes with heterozygous dominant for attached earlobes? (percent) - heterozygous for attached earlobes with heterozygous for attached earlobes. (percentage) - Homozygous dominant for attached earlobes with free earlobes. (Answer in percent)

Chloe has a family history of colorblindness. Corry, her partner, is affected by colorblindness. Colorblindness is an X-linked recessive condition that has the alleles XB which means -unaffected and dominant- and Xb which means -affected and recessive-. Chloe’s mom was affected, but her dad was not. Her partner Corry is also affected. (a)What is the probability that if Chloe and Corry were to have a daughter that she would be affected? (b)Also, what are the chances that if they had a son that he would be affected? Answer (a) and (b) by creating a pedigree and punnet squares

Having a pointed hairline, or Widow’s Peak, is controlled by a dominant allele, while a curved or straight hairline is recessive. Determine the phenotypes for both you and your partner.  What genotypic and phenotypic ratios would you expect in your offspring?

Assume that attached earlobes are an autosomal recessive trait with 73% penetrance. If one parent is heterozygous (Aa) and the other homozygous recessive (aa) for the attached earlobe gene, what is the probability that their second child will have attached earlobes? O 73% O 36.5% O 50% O 63.5% O 27% O 13.5% O 18.75%