ndson back to the black mare gave a blast and crossing a liver granddaughter bac

Question

ndson back to the black mare gave a blast and crossing a liver granddaughter back to the, stallion gave a chestnut foal. Explain how che nut or is being inherited in these horses. 22. Filled-in symbols in the pedigree that f a pla nate individuals who are deaf. a. Study the pedigree and explain how deafness being inherited. b. What is the genotype of the individuals in gen tion V? Why are they not deaf? 2 3 4 1 2 4 6 2 IV 1 2 3 4 6 1 2 3 4 5 6 78 9 10 11 12 13 m a cross between two true-breeding strains of zucchini. One has green fruit and the other p slante ore all reen, but

Explanation / Answer

Answer a:

Fromthe pedigree chart, we can safely say that it is an autosomal recessive trait since the trait of deafness being transferred are not found in all the generations (I,II,III,IV,V).

(a).In the 1st generation, both the parents are unaffected, while one of the offspring in 2nd generation i.e., II-1 is deaf. This is because the trait is autosomal recessive.

(b).In the 3rd generation, III-2 is affected, this is due to the recessive trait from 2nd generation, II-2 being the carrier of the mutant allele. The case of III-3 is the same as stated in [point (a)].

(c). Since both III-2 and III-3 are affected with recessive traits, their offsprings in the 4th generation are all affected

Answer b:

Whileboth IV-5 and IV-6 are both affected, their offsprings in the 5th generation are all unaffected.This is because the recessive trait of single gene cannot persists.

Genotypes: DD, Dd, DD, DD, DD,Dd,Dd,DD,Dd,Dd,DD,Dd,DD

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