Where the phenotype of both parents and the offspring are known and you then det

Question

Where the phenotype of both parents and the offspring are known and you then determine the genotype of each individual. In humans, brown eyes are dominant and blue eyes are recessive. Two brown-eyed people marry and produce one brown-eyed child and two blue-eyed children. What is the genotype of the parents and each of the children? Since both parents have brown eyes, they must have at least one allele for brown eyes, so their genotypes would be B _ (the _ means the allele could be either the dominant allele or the recessive allele). The genotype for the blue-eyed children must be bb. Since each parent contributed one allele to each blue-eyed off spring, you know that each brown-eyed parent has an allele for blue eyes. Therefore, the _ must be a b and the genotype for each parent is Bb. All you know about the brown-eyed offspring is that the child has one allele for brown eyes. The genotype could be either BB or Bb. In the remaining problems, try to determine the genotypes of the individuals. Take it slowly; only put down an allele when you are certain the individual has that allele. If you are not certain, merely show that you don't know by leaving a blank. Normal pigmentation (A) dominates no pigmentation (albino = aa). Brown-eyed coloring (B) dominates blue-eyed coloring (bb). Two people with normal pigmentation produce one brown-eyed, two blue-eyed, and two albino children. What are the possible genotypes for the parents? A red bull, when crossed with white cows, always produces roan-colored offspring. Explain how the colors for red. white, and roan are inherited In rabbits, short hair is due to a dominant allele. S; long hair to its recessive allele, s. Black hair is due to a dominant allele, B. and white hair to its recessive allele, b. When two rabbits were crossed, they produced 2.518 short-haired, black and 817 longhaired, black offspring. What are the probable genotypes of the parents? 24. In humans, the condition for normal blood clotting dominates hemophilia. Both alleles are sex-linked to the X chromosome. Two parents produced daughters who are all carriers and sons who are all normal. What are the probable genotypes of the parents? 25. In humans, deafness is due to a homozygous condition of either or both recessive alleles d and theta. Both dominant alleles D and E ate needed for normal hearing. Two deaf people marry and produce offspring who all have normal hearing. What are the probable genotypes of the children and parents?

Explanation / Answer

22) RR and ww gives all roan off spring.Ie., red bull * white cow gives all roan off spring.

25) The probable genotypes for children are DdEe and the probable genotyeps of the parents are DDee and ddEE.Parents who are homozygous dominant and recessive at opposite would at opposite loci would produce children who were heterogenous at both loci and thus have normal hearing.

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