Advertisements
Advertisements
Question
The number of pair(s) of sex chromosomes in the zygote of humans is :
(a) one
(b) two
(c) three
(d) four
Solution
The number of sex chromosomes in the zygote of humans is two-- XX in females and XY in males.
APPEARS IN
RELATED QUESTIONS
Explain sex determination in human beings.
There are two sets of chromosomes in the zygote.
In a human, how many chromosmes are present in a brain cell?
E is the gene for brown eye colour and an is the gene for blue eye colour. which gene is (1) recessive, and (2) dominant?
The person A has only B chromosomes in all its gametes. On the other hand, another person C has chromosome D in half of gametes and chromosome E in the other half of gametes. When chromosomes B and D combine during fertilisation, a female zygote results. On the other hand, combination of B and E chromosomes produces a male zygote.
(a) What are chromosomes (i) B (ii) D, and (iii) E?
(b) Out of B, D and E, which two chromosomes are of the same type?
(c) Which chromosome is smaller in size?
(d) What is the general name of chromosomes such as B and E?
(e) Out of the two persons A and C, which one is (i) male, and (ii) female?
________ shows haplo-diploid type of sex-determination.
Distinguish between heterogametic and homogametic sex determination systems.
What is male heterogamety?
Female heterogamy is shown by
