Sex determination in different organisms — NEET & JEE Questions

Question 1 · difficulty L1 · recall

The chromosomal sex-determination system in birds:

• A. ZZ male, ZW female
• B. XX male, XY female
• C. haploid male, diploid female
• D. ZW male, ZZ female

Question 2 · difficulty L1 · recall

The chromosomal sex-determination system in humans:

• A. ZZ female, ZW male
• B. haploid female, diploid male
• C. XX female, XY male
• D. XY female, XX male

Question 3 · difficulty L1 · recall

The system characteristic of honey bees:

• A. XO only
• B. XX-XY
• C. haplodiploidy
• D. ZZ-ZW

Question 4 · difficulty L2 · understanding

In humans, which parent determines the chromosomal sex of the offspring?

• A. The father, through X- or Y-bearing sperm
• B. The mother, because every ovum carries either X or Y
• C. Both parents contribute Y chromosomes
• D. Sex is determined only after birth

Question 5 · difficulty L2 · understanding

In the human XY system, the sex of the child is determined by whether the fertilising sperm carries

• A. X or Y chromosome
• B. only an X chromosome
• C. two X chromosomes
• D. no sex chromosome

Question 6 · difficulty L2 · understanding

In the ZW sex-determination system found in birds, the heterogametic sex is typically

• A. female
• B. male
• C. both sexes equally heterogametic
• D. neither sex

Question 7 · difficulty L3 · understanding

Which of the following statements are true with reference to the sex-determination in honeybees? A. An offspring formed from the union of a sperm and an egg, develops as a female (queen or worker). B. An unfertilized egg develops as a male by parthenogenesis. C. A male has half the number of chromosomes than that of a female. D. Males produce sperms by meiosis. E. Honeybees have a haplodiploid sex-determination system. Choose the correct answer from the options given below :

• A. A, B, C and E only
• B. B, C, D and E only
• C. A, B, C and D only
• D. A, B, D and E only

Question 8 · difficulty L3 · understanding

In a population of a grasshopper species, the chromosome number of some members is 23 and some other members possess 24 chromosomes. The 23 and 24 chromosome-bearing members in this species are $\_\_\_\_$ .

• A. females and males, respectively
• B. all males
• C. males and females, respectively
• D. all females

Question 9 · difficulty L3 · understanding

Select the correct statement/s with respect to mechanism of sex determination in Grasshopper. (A) It is an example of female heterogamety. (B) Male produces two different types of gametes either with or without X chromosome. (C) Total number of chromosomes (autosomes and sex chromosomes) is same in both males and females. (D) All eggs bear an additional X chromosome besides the autosomes. Choose the correct answer from the options given below :

• A. (B) and (D) only
• B. (A), (C) and (D) only
• C. (A) only
• D. (A) and (C) only

Question 10 · difficulty L3 · understanding

XO type of sex determination can be found in :

• A. Drosophila
• B. Birds
• C. Grasshoppers
• D. Monkeys