Advertisements
Advertisements
प्रश्न
In a human, how many chromosmes are present in a brain cell?
उत्तर
In a brain cell in a human has 46 chromosomes.
APPEARS IN
संबंधित प्रश्न
Differentiate between male and female heterogamety
Explain the mechanism of sex determination in birds.
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
Define the following:
Sex chromosomes
Complete the following sentence with appropriate word:
______are the alternative forms of a gene producing different effects.
Which of the following is incorrect regarding ZW-ZZ type of sex determination?
A woman has only daughters. Analyse the situation genetically and provide a suitable explanation.
Sex in honey bee is determined by ______.
Also describe as to, who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.
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?
