Assume that K and M are two unlinked genes that affect hearing. The dominant K allele is necessary for hearing, and the dominant M allele causes deafness regardless of the other genes present. Given this, what fraction of the offspring of parents with the genotypes KkMm and Kkmm will most likely be deaf?
A. 1/4
B. 3/8
C. 1/2
D. 5/8
ans:Option D Rationale.This option is correct.This is a Biology question that falls under the content category “Transmission of heritable information from generation to generation and the processes that increase genetic diversity.” The answer to this question is D, because among the offspring of KkMm and Kkmm parents, the ones who lack a dominant K allele (necessary for hearing), or carry a dominant M allele (causes deafness) are deaf. Based on the Punnett square analysis, 10 out of 16 or 5/8 of all offspring are likely to be deaf. This is Scientific Reasoning and Problem Solving question because it requires you to calculate the number of offspring with a particular phenotype from a parental cross.
What's the fastest way to do this problem? How do you do these kinds of problems quickly? Is there a general guideline to follow?
I generally confuse myself with these and try drawing out the punnet squares, but it takes too long. Thanks all
A. 1/4
B. 3/8
C. 1/2
D. 5/8
ans:Option D Rationale.This option is correct.This is a Biology question that falls under the content category “Transmission of heritable information from generation to generation and the processes that increase genetic diversity.” The answer to this question is D, because among the offspring of KkMm and Kkmm parents, the ones who lack a dominant K allele (necessary for hearing), or carry a dominant M allele (causes deafness) are deaf. Based on the Punnett square analysis, 10 out of 16 or 5/8 of all offspring are likely to be deaf. This is Scientific Reasoning and Problem Solving question because it requires you to calculate the number of offspring with a particular phenotype from a parental cross.
What's the fastest way to do this problem? How do you do these kinds of problems quickly? Is there a general guideline to follow?
I generally confuse myself with these and try drawing out the punnet squares, but it takes too long. Thanks all