We appreciate your visit to Labrador Retrievers come in the following phenotypes genotypes Black fur black nose B E Chocolate pink nose bbE Yellow black nose B ee Yellow pink. This page offers clear insights and highlights the essential aspects of the topic. Our goal is to provide a helpful and engaging learning experience. Explore the content and find the answers you need!
Answer :
The genotype of the male Labrador Retriever parent is bb ee, indicating homozygosity for black fur and a black nose.
The given information allows us to deduce the genotype of the male Labrador Retriever parent. Let's analyze the observed phenotypes of the 11 puppies:
2 black, black nose (b e b e): These puppies have the homozygous recessive genotype for fur color (bb) and nose color (ee).
4 yellow, black nose (bee): These puppies have the heterozygous genotype for fur color (Bb) and homozygous recessive genotype for nose color (ee).
3 chocolate, pink nose (blue): These puppies have the homozygous dominant genotype for fur color (BB) and homozygous dominant genotype for nose color (EE).
2 yellow, pink nose (bbee): These puppies have the heterozygous genotype for fur color (Bb) and heterozygous genotype for nose color (Ee).
Considering that the female parent is yellow with a pink nose (bbee), the only way to produce puppies with black fur and black noses (b e b e) is if the male parent carries the homozygous recessive genotype for both fur color (bb) and nose color (ee).
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The genotypes of the male parent of a litter with 11 puppies (2 black, black nose; 4 yellow, black nose; 3 chocolate, pink nose; 2 yellow, pink nose) where a female yellow lab with a pink nose mates with a black fur, black nose male can be determined using a Punnett square. The genotype of the male parent is Bbee.
A Punnett square is a tool used to determine the genotypes of offspring from two parents. In this case, the Punnett square can be used to determine the genotype of the male parent based on the phenotypes of the offspring.The genotype of the female yellow lab with a pink nose is bbee since she is yellow (bb or Bb), has a pink nose (ee), and the two alleles are on separate chromosomes.
The genotypes of the puppies are as follows:2 black, black nose (B_E_ or B_ee)4 yellow, black nose (bbE_ or bbee)3 chocolate, pink nose (bbEE)2 yellow, pink nose (bbee) . Since the female is bbee, and there are puppies with this genotype, the male parent must be carrying the recessive e allele. Since the female has a pink nose, she must be carrying two copies of the recessive e allele, while the male must be carrying one copy of the recessive e allele since some of the offspring have black noses. Therefore, the genotype of the male parent is Bbee.
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