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Hello I don’t understand this question. Please help me step by step to help me get the answer! This is a practice problem thank u,

Hello I don’t understand this question. Please help me step by step to help me get-example-1
User Chrispitzer
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1 Answer

19 votes
19 votes

Answer:

we can see that we have 2 short whiskers and 2 long whiskers , so the phenotypic ratio is 2:2 which is the same as 1:1

Step-by-step explanation

the question asks for the phenotype ratio of cross between two cats.

here we are told that the allele for short whiskers is Dominant (S) and the allele for long whiskers is recessive (s). this statement means that when we cross two cats with a dominant allele S, the cat will have short whiskers and when we have the recessive alleles only, the cat will have long whiskers.

in the Punnett square below a cat with Ss and ss alleles are crossed.

when we do a cross each individual allele from one cat is cross with the two alleles of the other cat to give a total of for crosses. we can see that the offsprings will have the following genotypes

Ss

ss

Ss

ss

since we now have the genotypes of the cats, we can use the information from above about dominant and recessive alleles to determine the phenotypic ratio

Ss - short whiskers

ss - long whiskers

Ss - short whiskers

ss - long whiskers

we can see that we have 2 short whiskers and 2 long whiskers , so the phenotypic ratio is 2:2 which is the same as 1:1

User Stephen Lombardo
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