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प्रश्न
Also describe as to, who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.
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उत्तर
As a rule the heterogametic organism determines the sex of the unborn child. In case of humans, since males are heterogametic it is the father and not the mother who decides the sex of the child. In some animals like crocodiles, lower temperature favour hatching of female offsprings and higher temperatures lead to hatching of male offsprings.
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संबंधित प्रश्न
What are the chromosomes XY and XX known as?
Fill in the following blank with suitable word :
The...............chromosomes for a ............are XX whereas that for a ..............are XY.
Explain how, sex is determined in human babies.
Which combination of genes in the zygote will produce children with brown eyes?
Name any two genetic in humans.
How many ovum are formed when a diploid cell undergoes meiosis, during oogenesis?
Identify the female heterogamety from the chromosomal complements given below.
Number of autosomes present in liver cells of a human female is ______.
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
A zygote which has an X-chromosome inherited from the father will develop into a ______.
The number of pairs of sex chromosomes in the zygote of a human being is ______
Which of the following is an example of genetic variation?
The maleness of a child is determined by ______
The maleness of a child is determined by
How many types of gametes are produced by a human female?
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.
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?
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?
Which biological mechanism establishes whether an individual develops as male or female based on genetic or chromosomal factors?
If a male grasshopper with XO genotype produces sperm, what proportion of his sperm will carry the X chromosome?
