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. How does it differ from that of human beings?
Which of the two, sperm or ovum, decides the sex of the child?
Which of the following combinations of sex chromosomes produce a male child : XX or XY?
Fill in the following blank with suitable word :
The...............chromosomes for a ............are XX whereas that for a ..............are XY.
Does the sex of the child depend on the father or it is just a matter of chance? Discuss.
Why did T. H. Morgan select Drosophila melanogaster to study sex linked genes for his lab experiments ?
________ shows haplo-diploid type of sex-determination.
Define the following:
Sex chromosomes
Choose the correct answer:
A single recessive trait, able to express must be on _________
Write a short note on sex determination in man.
Complete the following sentence with appropriate word:
______are the alternative forms of a gene producing different effects.
What is haplodiploidy?
How is sex determined in human beings?
Read the following statements and select the correct option.
i. If sperm containing Y chromosome fertilizes the ovum, then diploid zygote is formed that grows into a male child.
ii. If sperm containing X chromosome fertilizes ovum, then diploid zygote is formed, that grows into a female child.
The ‘X’ body of Henking was observed in ______.
Grasshopper is an example of XO type of sex determination in which the males have ______.
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 of the following determines the sex of a child?
A trait in an organism is influenced by
Which pair of sex chromosome will determine a male?
