Advertisements
Advertisements
प्रश्न
Differentiate between male and female heterogamety.
Advertisements
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
Explain the mechanism of sex determination in birds.
Which of the following is an example of ZW – ZZ type of mechanism of sex determination?
Which of the following combinations of sex chromosomes produce a male child : XX or XY?
The exchange of genetic material takes place in :
(a) vegetative reproduction
(b) asexual reproduction
(c) sexual reproduction
(d) budding
Both father and mother have the genes Ee in their cells. What colour are their eyes?
Explain the following terms:
Identical twins
Choose the correct answer:
A man can transfer his sex-linked gene to his ______________
Complete the following sentence with appropriate word:
______are the alternative forms of a gene producing different effects.
XO type of sex determination and XY type of sex determination are examples of ____________.
What is haplodiploidy?
Differentiate Intersexes from Supersexes.
Diploid larvae which get royal jelly as food develops into ____________ and other develops into workers (sterile females).
A man with blood group A marries a woman having blood group O. What will be the blood group of the child?
Female heterogamy is shown by
Name the two types of gametes produced by men.
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.
What is sex determination? Explain the mechanism of sex determination in the case of birds.
The sex chromosome in a human ovum is ______.
