Class 11: Dy-hybrid Cross of Independent Genes

Question 1

Genotype

Answer 1

Represents the genetic constitution of an individual.

Question 2

Phenotype

Answer 2

Physical, Observable characteristics.

Question 3

Mendel’s First Law

Answer 3

Principle of Segregation. A pair of genes gets separated during gamete formation.

Question 4

Dominant Allele

Answer 4

An allele that will give a phenotype to the offspring. Whether the offspring organism is heterozygote Aa or homozygote AA, it will have the phenotype of the dominant allele A.

Question 5

Recessive Allele

Answer 5

An allele that will give a phenotype to the final organism only if the organism is homozygote such as “aa”.

Question 6

Independent Assortment

Answer 6

Mendel Principle. Two genes on two chromosomes separate independently of each other.

Question 7

Punnett Square

Answer 7

A device that crosses both parents’ gametes to predict the genotype of their offspring

Question 8

What is a Dihybrid Cross? Cross RRBB x rrbb (P1) and then cross the F1 generation. Provide genotype, gametes, punnett squares, phenotypes, and probabilities.

Answer 8

A cross between two pure lines that results in a cross of heterozygote F1 generation. This cross gives you 16 possibilities for genotypes and a ratio of 9:3:3:1.