Advertisements
Advertisements
Question
Give Reason:
Why X-linked recessive diseases are more common among males than females.
Advertisements
Solution
Because females have two copies of the X-Chromosome and males have only one X- chromosome.
RELATED QUESTIONS
Explain sex determination in human beings.
Fill in the following blank with suitable word :
The...............chromosomes for a ............are XX whereas that for a ..............are XY.
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?
Choose the correct answer :
Human sex chromosomes are __________
Choose the correct answer:
A man can transfer his sex-linked gene to his ______________
Explain the mechanism of sex determination in humans with a suitable chart.
Differentiate Intersexes from Supersexes.
The belief that the mother is completely responsible for the sex of the child is wrong because the child
Fill the blank circles in figure and identify the sex of child A and B.
In the ZW–ZZ sex determination system, which sex is heterogametic?
