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Question
Differentiate between male and female heterogamety.
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Solution
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.
RELATED QUESTIONS
In a human, how many chromosmes are present in a fertilised egg?
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 exchange of genetic material takes place in :
(a) vegetative reproduction
(b) asexual reproduction
(c) sexual reproduction
(d) budding
The number of pair(s) of sex chromosomes in the zygote of humans is :
(a) one
(b) two
(c) three
(d) four
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
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are :
(i) large chromosome
(ii) small chromosome
(iii) Y chromosome
(iv) X chromosome
Name any two genetic in humans.
Define the following:
Sex chromosomes
Answer the following question:
How is sex determined in human beings? Explain with the help of a diagram.
Give Reason:
Why X-linked recessive diseases are more common among males than females.
Give Technical Term:
The cell which determines the sex of a baby.
Complete the following sentence with appropriate word:
______are the alternative forms of a gene producing different effects.
What is parthenogenesis?
How drones are produced in honey bees?
How is sex determined in human beings?
The number of pair (s) of sex chromosomes in the zygote of humans is
The sex chromosome in a human ovum is ______.
How is the sex of a newborn individual determined in different species of animals? Give three examples to support your answer.
