Question

How can it be determined whether the parent progeny is homozygous or heterozygous?

(a) Test cross

(b) Back cross

(c) Monohybrid cross

(d) Reciprocal cross

I had been asked this question in an interview for job.

This intriguing question comes from Genes, Chromosomes and Genomes topic in division Bioenergetics, Enzymes, Metabolism, Genes, Chromosomes and Genomes of Cell Biology

Answer 1

Right option is (a) Test cross

For explanation: Test cross is the cross of a F1 generation offspring with the homozygous recessive parent. If the offspring phenotype is dominant: recessive = 1:1, the F1 offspring is heterozygous dominant. If all the plant exhibits dominant phenotype, the F1 offspring is homozygous dominant. In this way, the genotype of an offspring can be determined.