Question

A plant is heterozygous for two genes. Its height is 20 feet while the minimum height of the plant is 6 feet the-
(i) Contribution of each dom allele
(ii) Height of plant with genotype
a) AABb
b) AaBb

Answer 1

An organism is considered heterozygous because there are two separate alleles of a gene known as diploid in its cells. Heterozygous genes, including Aa and Bb, are represented by upper case letters and a lower-case letter.

Complete answer:
The dominant genotype is only expressed in the case of individuals or species who mostly have more than one allele for the same gene. The dominant genotype is only expressed in heterozygous organisms. Two forms of gametes are shown in the case of heterozygous organisms. In the case of heterozygous organisms, the allele will display a full form of dominance, codominance, or incomplete dominance.
(i) Because the plant is heterogeneous with two chromosomes, it can also be referred to as AaBb. The minimum height is also 6 feet (in the case of aabb) while the height of this plant is 20 feet. This is possible only if a height of 7 feet is added to each dominant allele. There are two dominant alleles in the case of AaBb, making it $6\text{ }+\text{ }7\text{ }+\text{ }7\text{ }=\text{ }20$ feet in height.
(ii) height of genotyped plants
A) AABb-there are three dominant alleles here, so $6\text{ }+\text{ }7\text{ }+\text{ }7\text{ }+\text{ }7\text{ }+\text{ }7\text{ }=\text{ }27$feet
B) AaBb-there are two dominant alleles here, so $6\text{ }+\text{ }7\text{ }+\text{ }7\text{ }=\text{ }20$feet.

Note: A condition called hemizygous also exists other than homo and heterozygous. Hemizygous is a condition in diploid cells where only one copy of the gene or DNA sequence is present. On sex chromosomes, most males are hemizygous because they contain only one X and one Y chromosome. The autosomal gene indicates that the non-sex chromosome gene and the members of an autosome pair in a diploid cell have the same morphology as those allosome pairs with different structures.