6. Two dark-haired parents have a red-haired child. What genotype must the two p
ID: 227129 • Letter: 6
Question
6. Two dark-haired parents have a red-haired child. What genotype must the two parents have to permit this?
7. Assume that the dimple is inherited as a simple dominant gene. A dimpled man whose mother had no dimple married a woman with no dimple. What are the genotypes of the father, mother, F1 generation, and F2 generation?
8. In mice, yellow coat color (Z) is a dominant factor and black (z) is its recessive. The homozygous condition (ZZ) is lethal and kills the embryo within a few days after conception. If two yellow mice bred, what genotypes would you expect and in what ratio? What will be the phenotypes and in what ratio?
9. One variety of snapdragon with dominant yellow leaves always produce normal green leaf plants as well as yellow leaf heterozygous plants. The homozygous yellow leaf lack the ability to make chlorophyll and die as seedlings. Show the result of the cross of two yellow leaf plants.
10. Can wavy haired parents have a curly haired child?
11. Yellow guinea pigs crossed with white ones always produce cream-colored offspring. Matings between the two cream colored guinea pigs produced, in one case, 22 yellow, 47cream, and 19 white. What type of inheritance is this?
Explanation / Answer
6.In humans non-red hair color (H) is dominat to red hair color (h).The genotype of parents will be Hh.
7.D = dimple, d = no dimple.
A dimpled man whose mother had no dimples.It means man has at least one D allele,since its dominant to d.The man is Dd because his mother had no dimples.This means his mother was dd,so she had to give him a d allele.Now man married a women with no dimples.This means the woman he married was dd.
Father: Dd
Mother: dd
F1 = Dd * dd = Dd, Dd, dd, dd. Or 50% Dd, 50%dd
F2 = We can't actually calculate the F2 generation because all the offspring are not identical.We have 2 different possible genotypes, so we don't know if the F2 cross is Dd x Dd,Dd x dd,or dd x dd.
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