QUESTION 5 In Bridge\'s experiment, he proposed the concept of nondisjunction. W

Question

QUESTION 5 In Bridge's experiment, he proposed the concept of nondisjunction. Which of the following nondisjunction? best describes A. Because of nondisjunction, there can be two copies of the same chromosome in the gamete O B. Nondisjunction can occur in meiosis 1 O C Nondisjunction can occur in meiosis 2 0 D All of the above QUESTION 6 According to the chromosomal theory of inheritance, the law of segregation can be explained by O A. 0 B. Separation of homologous chromosomes in meiosis 2. O C Separation of homologous chromosomes in meiosis 1 Separation of sister chromatids in meiosis 1 0 D. Separation of sister chromatids in mneiosis 2.

Explanation / Answer

5. Nondisjunction is defined as the failure of separation of either sister chromatids or homologous chromosomes. This can result in production of two copies of same chromosomes. This can arise due to non-separation of homologous chromosome during meiosis 1 or non-separation of sister chrmatids during meiosis 2.

So, all options are correct.

6. Law of segregation states that either of the copies of a herditory trait is transfered independently in gametes. As we know, if two chromosomes are having an allele on aech, their separation will transfer the allele randomly. And the separation of homologous chromosomes occurs in meiosis 1, so the alleles get segregated in meiosis 1.

Meiosis 2 is the separation of sister chromatids, which results in separation of same allele.

In order to segregation to happen, two of the alleles must be separated.

So the correct option is a.

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