Hereditary and Variation MCQs for NEET — Botany Questions with Answers

Sex determination in Bonellia is governed by the presence or absence of bonellin, i.e., environmental factors. All larvae are genetically identical; if larva develops free in water it becomes adult female. The larvae that are exposed to bonellin in the skin of an adult female develop into males and are present in uterus of female. This makes option A wrong. Detachment of partly developed male from female body leads to its development into an intersex which makes option C wrong. Hence, option B is correct answer.

Progeny or individuals formed by the crossing of homozygous dominant and recessive parents is called F1 progeny and the generation is called F1 generation. Generation formed by the crossing of F1 progeny among themselves is called F2 generation.

So, the correct option is 'Crossing F1 individuals amongst themselves'

1. .

The probability of the fifth child being a daughter is 50%. Each child's gender is an independent event, meaning the outcome of one does not influence the others. The probability remains 50% for each child, regardless of previous outcomes.

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.