Question
Answer the following questions:
Explain sex determination in humans.
Explain sex determination in humans.
✓
Answer
Sex Determination in Humans:
- Humans show XY type of sex determining mechanism.
- Out of 23 pair of chromosomes, 22 are autosomes (same in both males and females).
- Females have a pair of X–chromosomes.
- Males have an X and a Y chromosome.
- During spermatogenesis males produce two types of gametes with equal probability – sperm carrying either X or Y chromosome.
- During oogenesis females produce only one types of gamete – having X chromosome.
- An ovum fertilised by the sperm carrying X–chromosome develops into a female (XX) and an ovum fertilised by the sperm carrying Y–chromosome develops into a male (XY).
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
What are the types of ecosystems? Give their suitable examples.
Classify the following white blood corpuscles given below as per Column A and complete Column ‘B’. Select from the given options:
(i) Eosinophils
(ii) T-lymphocytes
(iii) Neutrophils
(iv) Basophils
(v) B-lymphocytes
(vi) Monocytes
| Column A | Column B |
| (1) Phagocytic cells | ———— |
| (2) Cells involved in giving immune response | ———— |
| (3) Cells that increase during allergic and anti-allergic responses | ———— |
Plasmodium falciparum is the causative agent of the most severe form of malaria. It is distributed throughout the tropics. Explain why malaria is restricted to the tropics?
Flowering plants have developed many devices to discourage self-pollination and to encourage cross-pollination. Explain three such devices.
Why didn’t natural selection lead to the evolution of such totally harmless parasites?
While holding a tea cup Mr. Kothari’s hands rattle. Which disorder he may be suffering from and what is the reason for this?
Mrs. Peter and Mrs. James had babies at the same hospital. Mrs. Peter took home a girl, Nancy and Mrs. James received a boy, Richard. However, Mrs. James was certain she gave birth to a girl and brought suit against the hospital. Blood tests showed that Mr. James was type O, Mrs. James was type AB and Mr. and Mrs. Peter were both type B. Nancy was type A and Richard was type O. List the possible genotypes of each individual and then indicate the correct parents for each child.
Genotypes :
Genotypes :
- Mrs. Peter ____________.
- Mr. Peter ______________.
- Nancy _____________.
- Mrs. James _________________.
- Mr. James ________________.
- Richard _______________.
- Whose baby is Nancy?
- Whose baby is Richard?
What is the difference between a breed and a species? Give an example for each category.
What are the disorders caused due to hyposecretion and hypersecretion of GH or STH?
Mention some transgenic plants and their potential applications.