Principle of Inheritance and VariationEasyBloom L3

Question

Consider a gene that has two alleles and shows complete dominance. When two heterozygotes for this gene breed, they have a 25% chance of producing a homozygous recessive offspring. The next time they breed, what are the chances that they will once again have a homozygous recessive progeny?

Options

A.0%
B.25%
C.75%
D.100%

Solution

Sol.(b) [Key Concept: Probability — Independent Events in Genetics] Each conception/birth is an INDEPENDENT event. The probability remains 25% every time two heterozygotes (Aa × Aa) breed. Previous outcomes do not affect future probabilities (gametes do not 'remember' previous fertilisations). Aa × Aa always gives: 1/4 AA : 2/4 Aa : 1/4 aa — the chance of aa is always 25% regardless of what occurred in previous matings.

Create a free account to view solution

View Solution Free
Topic: Principle of Inheritance and Variation·Practice all Principle of Inheritance and Variation questions

More Principle of Inheritance and Variation Questions

Change in the sequence of nucleotide in DNA is called as...If a cross is made between two individuals each having genotype Bb, two offspring are obtained. out of these one has dom...In F2 generation the phenotype and genotype ratio are same in case of :-...Which of the following structure was discovered by Henking...In a certain plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If ...