NEET UG 2023 — Principles of Inheritance and Variation

Broad palm with single palm crease is visible in a person suffering from-

Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by

In which disorder change of single base pair in the gene for beta globin chain results in change of glutamic acid to valine?

Match List-I with List-II.  Choose the correct answer from the options given below :

Select the correct statements about sickle cell anaemia. (A) There is a change in gene for beta globin. (B) In the beta globin, there is valine in the place of Lysine. (C) It is an example of point mutation. (D) In the normal gene $U$ is replaced by $A$. Choose the correct answer from the options given below:

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 $\mathrm{X}$ chromosome. (C) Total number of chromosomes (autosomes and sex chromosomes) is same in both males and females. (D) All eggs bear an additional $\mathrm{X}$ chromosome besides the autosomes. Choose the correct answer from the options given below :

The phenomenon of pleiotropism refers to:

Which of the following statements are correct about Klinefelter's Syndrome? A. This disorder was first described by Langdon Down (1866). B. Such an individual has overall masculine development. However, the feminine development is also expressed. C. The affected individual is short statured. D. Physical, psychomotor and mental development is retarded. E. Such individuals are sterile. Choose the correct answer from the options given below:

Which one of the following symbols represents mating between relatives in human pedigree analysis?