Advertisements
Advertisements
प्रश्न
Define the following:
Sex chromosomes
Advertisements
उत्तर
Sex chromosomes - The chromosomes which determine the sex of an individual are called sex chromosomes.
APPEARS IN
संबंधित प्रश्न
Fill in the following blank with suitable word :
Genes always work in ................ .
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
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are:
- large chromosome
- small chromosome
- Y chromosome
- X chromosome
Which combination of genes in the zygote will produce children with brown eyes?
Distinguish between heterogametic and homogametic sex determination systems.
Which of the following develops through parthenogene is?
The belief that the mother is completely responsible for the sex of the child is wrong because the child
Sex of an individual is determined by different factors in various species. Some animals rely entirely on the environmental ones, while in some other animals the individuals can change their sex during their life time indicating that sex of some species is not genetically determined. However in human beings, the sex of an individual is largely determined genetically.
- In what way are the sex chromosomes 'X' and 'Y' different in size? Name the mismatched pair of sex chromosome in humans.
- Write the number of pair/pairs of sex chromosomes present in human beings. In which one of the parent (male/female) perfect pair/pairs of sex chromosome are present?
- Citing two examples, justify the statement "Sex of an individual is not always determined genetically".
OR
Draw a flow chart to show that sex is determined genetically in human beings.
How is the sex of a newborn individual determined in different species of animals? Give three examples to support your answer.
Which of the following organisms exhibits the XX–XY sex determination system?
