ividuals who are heterozygous for both eye color and hair form are said to be doubly heterozygous, dihybrids. Dihybrids might arise from true-breeding parents, one parent being the double nozygous dominant and the other being the double homozygous recessive: Parents (P): AABB X aabb Offspring (F1): AB AaBb ab
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- Show the complete solution including the Punnett Sq. Lina has dimples, freckles, and a widow’s peak. She is a heterozygous for all of the three traits. David, her husband also has freckles and dimples but has a continuous hairline. As freckle is known to be dominant over none, dimples are dominant over no dimples, and widow’s peak is dominant over continuous hairline, what is the a) Probability that their child will have three recessiveness: no freckle, no dimples, and has widow’s peak; and b) Probability that their child will have the same phenotype as Lina (with freckles, dimples, and widow’s peak)? Legend: Ff – freckles Dd – dimples Ww – widow’s peakddTtBbqqAA X ddttBbQqaa:probability of producing an individual that is dominant for B & A and recessive for D, T and Q?young couple is planning to have children. The male is heterozygous for Huntington’s disease and homozygous dominant for Tay-Sachs. The female is homozygous recessive for Huntington’s disease and heterozygous for Tay-Sachs. The couple is curious about the possibility and probability of their offspring inheriting Tay-Sachs and/or Huntington’s. For humans, Huntington’s disease is dominant (H) over the “normal” condition (h), and the “normal” condition is dominant (T) over Tay-Sachs (t). Complete a Punnett square for this cross and record the percent probabilities for genotypes and phenotypes of the offspring.
- What is the probability of a child having a recessive disorder if both parents are heterozygous carriers? A. 1/2 B. 1/4 C. 3/4 D. 2/3 E. ZeroBy looking at the following table, circle the trait which is sex-influenced. Genotype Male Female BB Bald Bald Bb Bald Non-bald bb Non-bald Non-baldIf an individual has no widow's peak, but both parents have widow's peaks, which genotypes are possible for the parents? Heterozygous Homozygous dominant Unable to determine Homozygous recessive
- Examine the following pedigrees. Which is the most likely mode of inheritance of each disorder? (a) autosomal recessive (b) autosomal dominant (c) X-linked recessive (d) a, b, or c (e) a or c 10.A person has the genotype AabbCCDdEEFfGgHH for 8 genes. State how many genes are homozygous dominant, how many genes are heterozygous, and how many genes are recessive.A woman homozygous dominant for albinism marries a man who is homozygous recessive for albinism. What are the possible genotypes and phenotypes percentages for their offspring?
- Please define the following terms: Gene Allele Dominant Recessive Homozygous HeterozygousDemonstrate how males are at an increased risk of sex-linked recessive traits by crossing a female who is a carrier for Hunter syndrome with a normal male. The genotypes involved are XH, Xh, and Y. State the genotypes and phenotypes of the offspring.Parents Genotype : Bb/bb – Eye Color - (brown eyes dominant , blue eyes recessive) Dd- Dimples ( dominant) Cc/cc- Cleft chin (Dominant) Sarah BbDdcc James bbDdCc If they plan to have 4 children, what is the probability of having: all boys with cleft chin?