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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
In a human, how many chromosmes are present in a skin cell?
The human animal which has an XY pair of chromosomes is called :
(a) male
(b) hybrid
(c) female
(d) doomed
The number of pair(s) of sex chromosomes in the zygote of humans is ______.
Does the sex of the child depend on the father or it is just a matter of chance? Discuss.
________ shows haplo-diploid type of sex-determination.
Choose the correct answer :
Human sex chromosomes are __________
Distinguish between heterogametic and homogametic sex determination systems.
What is male heterogamety?
How is sex determined in human beings?
How many ovum are formed when a diploid cell undergoes meiosis, during oogenesis?
Number of autosomes present in liver cells of a human female is ______.
Fill the blank circles in figure and identify the sex of child A and B.
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.
What is the probability of a girl or a boy being born into a family? Justify your answer.
How is the sex of a newborn individual determined in different species of animals? Give three examples to support your answer.
A zygote which has Y chromosome inherited from the father will develop into a ______.
Which biological mechanism establishes whether an individual develops as male or female based on genetic or chromosomal factors?
An organism that possesses both male and female reproductive organs in the same individual is classified as which type?
In 1891, H. Henking studied spermatogenesis in squash bugs and observed that a specific nuclear structure was present in what percentage of the resulting sperms?
