NEET UG 2010 — Principles of Inheritance and Variation

The genotype of a plant showing the dominant phenotype can be determined by

In Antirrhinum, two plants with pink flowers were hybridized. The $\mathrm{F}_1$ plants produced red, pink and white flowers in the proportion of 1 red, 2 pink and 1 white. What could be the genotype of the two plants used for hybridization? Red flower colour is determined by $\mathrm{RR}$, and white by $\mathrm{rr}$ genes.

Select the correct statement from the ones given below with respect to dihybrid cross.

Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?

ABO blood grouping is controlled by gene I, which has three alleles and show codominance. There are six genotypes. How many phenotypes in all are possible?

$\quad$ ABO blood groups in humans are controlled by the gene I. It has three alleles $-\mathrm{I}^{\mathrm{A}}, \mathrm{I}^{\mathrm{B}}$ and $\mathrm{i}$. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

Which one of the following symbols and its representation, used in human pedigree analysis is correct? 

The fruit fly, Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because

Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character. 

A cross in which an organism showing a dominant phenotype is crossed with the receseive parent in order to know its genotype is called