Question

The Otonabee River, which passes through Trent University, is home to a unique subspecies of Carp known as Cyprinus carpio excaliburous. Recently, it was discovered that these fish exist as either green or albino.  

Part l: Monohybrid Cross -Question 1 Questions 1-3 are based on the following situation. The Otonabee River, which passes through Trent University, is home to a unique subspecies of Carp known as Cyprinus carpio excaliburous. Recently, it was discovered that these fish exist as either green or albino Green Carp Albino Carp A pure-breeding green carp mated with a pure-breeding albino carp. The resulting F1 generation was then allowed to mate with each another. There were 208 carp produced in the F2 generation; 156 of these were green and the remaining 52 were albino 1. What colour were the carp from the F1 generation? (1 mark) Albino Green

Answer 1

Ans: The color of the carps from F1 generation is green as green is the dominat allele.

Explanation:

A monohybrid cross is mating between two organisms with different variations at one genetic chromosome of interest.

According to the question, pure breeding green carp (GG) x pure breeding albino carp (AA)

Thus in F1 generation, all carp have the genotype GA.

	G	G
A	GA	GA
A	GA	GA

Now they are allowed to mate with each other. ( GA X GA)

Thus the outcome of F2 generation is:

	G	A
G	GG	GA
A	GA	AA

Probability theory predicts that three parts of the F2 generation will have the dominant allele's phenotype and the remaining quarter of the F2 generation will have the recessive allele's phenotype.

According to the question, there were 208 carps produced in F2 generation. 156 of those were green and the remaining 52 were albino. That is they are in 3:1 ratio. (GG+GA) : AA = 156 (GREEN) : 52 (ALBINO) = 3 *52 (GREEN) : 52 (ALBINO) = 3:1

Thus, green is the dominant allele. In F1 generation all the carps have heterozygous phenotype (GA). Thus it will have the color of dominant allele. That is in this case Green.

The color of the carps from F1 generation is green as green is the dominat allele.