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11 February, 12:20

A zonkey comes from a zebra (46 diploid chromosomes) and a donkey (62 diploid chromosomes).

What is the cromosome number of the zonkey?

What would happen when meiosis occurs in the zonkeys reproductive organs?

Why zonkeys are ussualy sterile?

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  1. 11 February, 13:34
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    Q1. The answer is 53 chromosomes

    Zebra has 44 diploid chromosomes (2n = 44). Zebra's gametes are haploid, so they will have 22 chromosomes (n = 22).

    Donkey has 62 diploid chromosomes (2n = 62). Zebra's gametes are haploid, so they will have 31 chromosomes (n = 31).

    After fusion of zebra's gamete (n = 22) and donkey's gamete (n = 31), the zonkey's zygote will have 22 + 31 = 53 chromosomes

    Q2 and Q3. In the meiosis, the number of chromosomes is reduced by half. Since zonkey has 53 chromosomes, after meiosis it should have 53/2 chromosomes, which is not the whole number. This is the reason why they cannot produce normal gametes that will result, after the fusion, in the production of normal diploid zygote
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