Based on your Punnett square for question number 5, what percentage of guinea pigs will have long hair and what percentage of guinea pigs will have short hair if parents have the genotypes BB and bb? (Remember: In guinea pigs, short hair is dominant to long hair.)

The correct answer would be :

Long hair guinea pig = 0%

Short hair guinea pig = 100%

Explanation:

It is given in the question that the Guinea pigs have a gene for the length of the hair have two alleles long hair and short hair where short hair is dominant and long hair is recessive.

short hair = B

long hair = b

Cross between BB and bb, there will be gametes B, B, and b, b.

    B     B

b  Bb   Bb

b  Bb   Bb

So there is all the offspring are in a heterozygous condition which means the dominant allele only expressed in offspring which is short hair so the percentage of the short hair guinea pig will be 100% and zero percentage for long hair.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.