In mice, a male and female are mated, both with long ears. All female have long
ID: 301739 • Letter: I
Question
In mice, a male and female are mated, both with long ears. All female have long ears but half the males bave short ears and half have ong ears the mode of inheritance and what is the genotype of the parents? 4. , what is 5. A man with color blindness marries a normal woman. What is the chance that this family wl have a son with color blindness? 6. A woman with color blindness marries a normal man. What is the chance that this family will have a daughter with color blindness? A son with color blindness? 7. A normal man and normal woman marry. What is the chance that they will produce a male child with Down's syndrome? 8. In hippies, X linked trait frizzy hair is dominant to straight hair. Devise a breeding program so that the sex of the offspring can be determined merely by looking at hair texture.Explanation / Answer
Please find the answers below:
Answer 4: According to the information, all females were long-eared whereas all males were normal. Further, the parent male was also long-eared. This clearly suggests that the trait is inherited in X-linked recessive manner. All the females are homozygous for the trait whereas all males carrying affected allele will be long-eared. Thus, the genotype of parents are, mother is homozygous and father is heterozygous for the trait.
Answer 5: Color-blindness is inherited in X-linked recessive manner. This means that the male must be carrying the allele whereas the normal mother can be either non-carrier or heterozygous for the trait. If the normal mother is heterozygous for the trait, the Punnett square can be formulated as below:
Thus, this table clearly suggests that 50% of the male progeny will be affected whereas the rest 50% males will be normal in nature.
Answer 6: The genotype of the colorblind mother should be homozygous whereas the father's should be normal. The Punnett square can be formulated as below"
Thus, the chances of having affected daughters : 0%
The chances of having affected son : 100%
Answer 7: Down's syndrome is a chromosomal abberation which takes place due to faulty disjunctioning of the chromosomes..As a result, the the 21st pair of human chromosome contains an extra chromosome. This results in Down's syndrome. Hence, the syndrome is not genetically inherited and hence the demographic data suggests t1/700 - 1/1000 newborns are affected by the disease.
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