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प्रश्न
Differentiate between male and female heterogamety.
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उत्तर
Male heterogamety: Male heterogamety includes human males having XY sex chromosomes and males of some insects, such as grasshopper and bugs, having XO sex chromosomes.
Female heterogamety: Female heterogamety includes females of some species of birds, fishes and insects. Females of butterfly and moth consist ZO sex chromosomes, while females of fish, reptiles and birds consist ZW sex chromosomes.
संबंधित प्रश्न
Answer the following questions related to sex determination in human beings:
i. What is sex chromosome?
ii. How many pairs of chromosomes are present in human beings?
iii. How is the sex of the human offspring determined?
iv. Draw a diagram depicting sex determination in man.
A new born child has an XY pair of chromosmes. Will it be a baby boy or a baby girl?
In a human, how many chromosmes are present in a fertilised egg?
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
A zygote which has inherited an X chromosome from the father will develop into :
(a) baby boy
(b) baby girl
(c) adult
(d) either boy or girl
E is the gene for brown eye colour and an is the gene for blue eye colour. which gene is (1) recessive, and (2) dominant?
Does the sex of the child depend on the father or it is just a matter of chance? Discuss.
A family consists of two parents and their five children and the pedigree chart below shows the inheritance of the trait colour blindness in them.
Who is colour blind in the parents – the Father or the Mother?
Choose the correct answer:
A single recessive trait, able to express must be on _________
What is parthenogenesis?
ZW-ZZ system of sex determination occurs in
Distinguish between heterogametic and homogametic sex determination systems.
Match the items of Column I with Column II:
| Column I | Column II | ||
| i. | XX-XO method of Sex Determination | a. | Turner syndrome |
| ii. | XX-XY method of Sex Determination | b. | Female heterog ametic |
| iii. | karyotype-45 | c. | Grasshopper |
| iv. | ZW-ZZ method of Sex Determination | d. | Female homogametic |
Diploid larvae which get royal jelly as food develops into ____________ and other develops into workers (sterile females).
Which of the following develops through parthenogene is?
Which of the following combination of chromosome numbers represents the correct sex determination pattern in honey bees?
A trait in an organism is influenced by
Does a male child inherit X chromosome from his father? Justify.
Twins are born to a family that lives next door to you. The twins are a boy and a girl. Which of the following must be true?
