Advertisements
Advertisements
प्रश्न
What is heterogamety ? Explain the mechanism of sex determinatin in Drosophila.
Advertisements
उत्तर
Heterogamety - Either male or female individual produces two different types of gametes.
Mechanism of sex determination in Drosophila. In Drosophila, the males have one X and one Y chromosome, whereas females have a pair of X-chromosomes besides autosomes.
APPEARS IN
संबंधित प्रश्न
Why did T. H. Morgan select Drosophila melanogaster to study sex linked genes for his lab experiments ?
________ shows haplo-diploid type of sex-determination.
Choose the correct answer:
Chromosomes identical in male and female are called __________
Give Technical Term:
The cell which determines the sex of a baby.
Complete the following sentence with appropriate word:
___________ chromosomes do not take part in sex determination.
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are ______.
- large chromosome
- small chromosome
- Y-chromosome
- X-chromosome
The maleness of a child is determined by ______
A zygote which has an X-chromosome inherited from the father will develop into a
All human chromosomes ate not paired. Most human chromosomes have a maternal and a paternal copy, and we have 22 such pairs. But one pair called the sex chromosomes, is odd in not always being a perfect pair. Women have a perfect pair of sex chromosomes. But men have a mismatched pair in which one is normal sized while the other is a short one.
(a) In humans, how many chromosomes are present in a Zygote and in each gamete?
(b) A few reptiles rely entirely on environmental cues for sex determination. Comment.
(c) "The sex of a child is a matter of chance and none of the parents are considered to be responsible for it." Justify it through flow chart only.
OR
(c) Why do all the gametes formed in human females have an X chromosome?
