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प्रश्न
Write the types of sex-determination mechanisms the following crosses show. Give an example of each type.
(i) Female XX with Male XO
(ii) Female ZW with Male ZZ
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उत्तर
(i) The type of sex determination mechanism shown in female XX with male XO is male heterogamety.
Example- Humans
(ii) The type of sex determination mechanism shown in female ZW with male ZZ is female heterogamety.
Example- Birds
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संबंधित प्रश्न
Explain the following terms:
Identical twins
Choose the correct answer:
Chromosomes identical in male and female are called __________
Choose the correct answer:
A single recessive trait, able to express must be on _________
Which of the following organisms has haploid number of chromosomes?
Number of autosomes present in liver cells of a human female is ______.
The number of pairs of sex chromosomes in the zygote of a human being is ______
Select the incorrect statement
Fill the blank circles in figure and identify the sex of child A and B.
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?
