Construct a Punnett Square...?

Question

for the cross of a heterozygous black guinea pig and an unknow guinea pig whose offspring include a recessive white furred individual. What are the possible genotypes of the unknown parent?

Answer 1

Do you understand how a punnett square works? It is probably the most simple genetics you will ever see in school, so make sure you understand it.

Like a multiplication table using unknowns....
1. You know the genotype of one adult a Hetero which is black
Lets call this Bb
2. You know that one of the offspring is a white recessive, and so must be bb.
3. So, If you divide Bb into its two possible alleles, B & b, what possible genotypes would be needed to produce a bb in the resultant punnett square?
...Think logically. Your product is bb. One of the alleles is a b. Thus, one of the parents needs to contain at least one recessive b allele.
You will have two different answers.

Please, work through it. Understand it. And explain it to someone else.

Answer 2

try each one...its pretty easy

for the unknown try a heterozygous

then try homozygous white, and homozygous black

you know that the black trait is dominant since the black heterozygous is black.

The rest is easy, try doing it!

Answer 3

a ressesive heterozygous white guinea pig, or a ressesive homozygous white pig