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प्रश्न
What is Lyonisation?
उत्तर
Lyonisation is a process of inactivation of one of the X chromosomes in some females.
संबंधित 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
Differentiate between male and female heterogamety
Which of the two, sperm or ovum, decides the sex of the child?
A normal cell of human body contains 23 pairs of chromosomes. The number of chromosomes in a sex cell (sperm or ovum) of a human being is most likely to be :
(a) 46
(b) 23
(c) 21
(d) 42
The two versions of a trait (character) which are brought in by the male and female gametes are situated on :
(a) copies of the same chromosome
(b) sex chromosomes
(c) two different chromosomes
(d) any chromosomes
The sex of a child is determined by which of the following?
(a) the length of the mother's pregnancy
(b) the length of time between ovulation and copulation
(c) the presence of and X chromosome in an ovum
(d) the presence of a Y chromosome in a sperm
Both father and mother have the genes Ee in their cells. What colour are their eyes?
Which combination of genes in the zygote will produce children with brown eyes?
Does the sex of the child depend on the father or it is just a matter of chance? Discuss.
Choose the correct answer:
Chromosomes identical in male and female are called __________
Give Technical Term:
The cell which determines the sex of a baby.
Which of the following is incorrect regarding ZW-ZZ type of sex determination?
The ‘X’ body of Henking was observed in ______.
In XO type of sex determination ______.
Which of the following is an example of genetic variation?
A trait in an organism is influenced by
The belief that the mother is completely responsible for the sex of the child is wrong because the child
Also describe as to, who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.
Does a male child inherit X chromosome from his father? Justify.
What is sex determination? Explain the mechanism of sex determination in the case of birds.
