Genetics and Plant Breeding

A fruit fly heterozygous for sex linked genes is mated with a normal female fruit fly. The male specified chromosome is likely to enter egg cells in the proportion of 1:1. 

This is the correct option. The blood group of the individual will be B.

Both are false statements. In pleiotropic inheritance, different traits are controlled by a single gene. Skin colour is controlled by 3 pairs of genes. This is the correct answer.

Correct answer. Interaction between two alleles which are present on the same gene locus of two homologous chromosomes is called intragenic interaction. Interaction between the alleles of different genes on the same or different chromosome is called intergenic interaction.  

GLK gene pairs regulate chloroplast development in diverse plant species. As GLK genes are not found in any algal or non-plant genomes, GLK transcription factors evolved to regulate chloroplast development as plants moved on to land.

The blood group of a person will be AB if the genotype is I^AI^B.

Members of a pure genetic line are homozygous.

The genes which tend to be inherited together are linked genes.

The ABO blood group in human beings is a good example of multiple gene inheritance.

With respect to X-linked genes males are said to be hemizygous. Having some single copies of genes in an otherwise diploid cell or organism is hemizygous.

The pattern of inheritance of sex linked character haemophilia is called dygenic criss cross inheritance .

It is the correct answer as r is a recessive character and Y is a dominant character. Hence, rrYY and rrYy means wrinkled yellow.

Polygenic inheritance occurs when one characteristic is controlled by two or more genes.

In this Mendelian law, organisms inherit two alleles for each trait. 

It is not economical. Plants waste a lot of energy and food materials in unnecessary adaptations and devices to bring about pollination. It is uncertain because a factor of chance is always involved.