Define the following terms :
a. Dihybrid cross b. Homozygous
c. Heterozygous d. Test cross
Answers
a. Dihybrid cross is a cross between two different lines/genes that differ in two observed traits. According to Mendel's statement, between the alleles of both these loci there is a relationship of completely dominant - recessive traits.
b. Homozygous is a word that refers to a particular gene that has identical alleles on both homologous chromosomes. It is referred to by two capital letters (XX) for a dominant trait, and two lowercase letters (xx) for a recessive trait.
c. .. If the two alleles at a locus are identical to each other, they are homozygous; if they are different from one another, they are heterozygous. Like all words with the prefix hetero, heterozygous has to do with things that are different — specifically genes.
d. Test crosses are used to test an individual's genotype by crossing it with an individual of a known genotype. Individuals that show the recessive phenotype are known to have a homozygous recessive genotype.
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