Reproduction in Organisms Class 12 MCQs Questions with Answers

1. ZZ/ZW type of sex determination is seen in

2. Which of the following is correct for the condition when plant YyRr is back crossed with the double recessive parent ?

3. Experimental verification of ‘chromosomal theory of inheritance’ was done by

4. The distance between the genes is measured by

5. Genetical identification of male human is

6. Among the following characters, which one was not considered by Mendel in his experiments of
pea__________

7. Which Mendelian idea is depicted by a cross in which F1 generation resembles both the parents_________

8. Where are the genes for cytoplasmic male sterility in plants located?

9. First geneticist/father of genetics was:

10. In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine ?

11. Trisomy is represented by

12. This abnormality occurs due to monosomy (2n – 1); the individual has 2n = 45 chromosomes with 44 + XO genotype.

13. A test cross is carried out to__________

14. Which of the following are reasons for Mendel’s success ?
(i) Usage of pure lines or pure breeding varieties
(ii) Consideration of one character at a time
(iii) Maintenance of statistical records of experiments
(iv) Knowledge of linkage and incomplete dominance

15. Select the disease which is caused by recessive autosomal genes when present in homozygous conditions.

16. All genes located on the same chromosome

17. Human blood grouping is called ABO instead of ABC because O signifies_______

18. If both parent are carriers for thalassemia, which is an autosomal recessive disorders, what are the chances of pregnancy resulting in an affected child?

19.  Genotype of hybrid is determined by___________

20. A trait that “overpowers” and hide another trait is called