a. Which aicU b. What are the most probable genotyl in each cross? 6. W t tail.

Question

a. Which aicU b. What are the most probable genotyl in each cross? 6. W t tail. Six pairs of es and those of their A mutant allele in mice causes a bent tail. SIX pa mice were crossed. Their phenotyp progeny are given in the following table. N is norhia phenotype; B is bent phenotype. Deduce the mod heritance of bent tail. e of in- 8. Parents Progeny Cross 10. All N All B B, INJB, IN All B All N All B All B All B All N All B 11. 12 13 4 a. Is it recessive or dominant? b. Is it autosomal or sex-linked? c. What are the genotypes of all parents and progeny?

Explanation / Answer

Answer:

A) Dominant

B) X-linked

C) Genotype of all parents and progeny

                        Female                         Male                            Genotype                   

1.         N                                 B                                 b/b X B/Y                  

2.         B                                 N                                 B/b X b/Y

3.         B                                 N                                 B/B X b/Y

4.         N                                 N                                 b/b X b/Y

5.         B                                 B                                 B/B X B/Y

6.         B                                 B                                 B/b X B/Y

Explanation:

The trait is X-linked dominant as all the daughters, but none of the sons, of affected father are affected, given mother is normal. It is a characteristic feature of such type of inheritace.

The genotype denotes: B=affected X, b= normal X, and Y.

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