Sarita Aggarwal Solutions for Exercise 2: Solved Questions from ICSE Board Examination Papers

Give the scientific name of the plant on which Mendel conducted his hybridization experiments.

A homozygous plant having round (R) and yellow (Y) seed is crossed with a homozygous plant having wrinkled (r) and green (y) seeds:
Give the genotype of ${\mathrm{F}}_1$ generation.

A homozygous plant having round (R) and yellow (Y) seed is crossed with a homozygous plant having wrinkled(r) and green (y) seeds:
$\left(\mathrm{i}\right)$ Give the dihybrid phenotypic ratio and the phenotype of the offspring of the ${\mathrm{F}}_2$ generation when two plants of the ${\mathrm{F}}_1$ generation are crossed.
$\left(\mathrm{ii}\right)$ Name and state the law which explains the dihybrid ratio.

Given below is a schematic diagram showing Mendel's Experiment on sweet pea plants having axial flowers with round seeds (AARR) and Terminal flowers with wrinkled seeds (aarr). Study the same and answer the questions that follow.

$\left(\mathrm{i}\right)$ Give the phenotype of ${\mathrm{F}}_1$ progeny.
$\left(\mathrm{ii}\right)$ Give the phenotype of ${\mathrm{F}}_2$ progeny produced upon by the self-pollination of ${\mathrm{F}}_1$ Progeny.
$\left(\mathrm{iii}\right)$ Give the phenotype ratio of ${\mathrm{F}}_2$ progeny.
$\left(\mathrm{iv}\right)$ Name and explain the law induced by Mendel on the basis of the above observation.

Given below are groups of terms. In each group the first pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis. Example: Oxygen : Inspiration : : Carbon dioxide : Expiration
TT : Homozygous : : Tt : _____.

In a homozygous pea plant, axial flowers (A) are dominant over terminal flowers (a).
$1.$Draw a Punnett square board to show the gametes and offspring when both the parent plants are heterozygous for axial flowers.
$2.$What are the phenotypic ratio and genotypic ratio of the above cross shown in (1)?

State Mendel's Law of Dominance.

Choose and write the correct pair of genetic disorders commonly seen in human males.