Botany MCQs for NEET — Practice Questions with Answers

In humans, the sex chromosomes are designated XX for females and XY for males. The XX - XY system is responsible for determining the sex of an individual. Females have two X chromosomes, while males have one X and one Y chromosome.

The number of linkage groups present in an individual corresponds to the number of chromosomes in its one genome (all the chromosomes if haploid or homologous pairs if diploid). ... Maize has 10 linkage groups, as it has 10 pairs of chromosomes haploid set is 10.

Crossing over during meiosis occurs between non-sister chromatids of homologous chromosomes. This process increases genetic diversity by exchanging segments of DNA, leading to new combinations of genes in the gametes.

Incomplete linkage refers to the situation where genes that are located close to each other on the same chromosome are not always inherited together. In Drosophila, incomplete linkage leads to the production of offspring with both parental and non-parental (recombinant) combinations. The percentage of non-parental combinations typically observed in incomplete linkage is 17%.

Recombination is the process by which genetic material is shuffled during meiosis, resulting in offspring with combinations of traits that differ from those found in either parent. This generation of non-parental gene combinations increases genetic diversity.

A back cross is a cross between a hybrid organism and one of its parents or an organism genetically similar to its parent. This is done to achieve offspring with a genetic identity which is closer to that of the parent.

The checkerboard method of calculations, commonly known as the Punnett square, was developed by Reginald C. Punnett. It is a tool used in genetics to predict the genotype and phenotype combinations in a genetic cross.

In humans, height shows a lot of variation because it is an example of polygenic inheritance. This means that multiple genes contribute to the trait, resulting in a wide range of phenotypes.