If you cross a homozygous dominant organism with a homozygous recessive organism...?

Question

what percent of the offspring will be homozygous recessive?

Answer 1

This is easy if you know what the terms mean.

Homozygous means that the two alleles for a trait are the same. When you write the genes for a homozygous individual, both letters are the same. Ex: BB is homozygous dominant and bb is homozygous recessive.

If you cross BB and bb, all the offspring will have a B from one parent and a b from the other parent. Bb is heterozygous. So 0% of the offspring will be homozygous recessive.

homo- means same
hetero- means different

Answer 2

When you cross it with a homozygous recessive organism, if the organism exhibiting a dominant trait is homozygous dominant; all of the offspring will exhibit the dominant trait, as they'll receive one allele from each parent, so let's say for example a cross between RR and rr will produce 100% Rr offspring. But if the organism turned out to be heterozygous recessive, 50% of the offspring will exhibit the dominant trait and the other half won't (a cross between Rr and rr will produce half rr and half Rr). Try doing Punnett squares and you'll understand.

Answer 3

Steff, I want to caution you with the utmost importance. Once upon a time, man thought that some things were totally offcourse genetically, then the once only came along accidentally, and there was so much to be learned from these situations that once could be risked. I mean risk in capital letters.YOu will not find this information anywhere, but in the pain of the grieving relatives of those who were allowed to happen knowing the end was less than ideal. Love, peace, and anything you can glean,
Michelle

Answer 4

BB x bb
= BB, Bb, Bb, bb

1/4 are bb
=25%

Answer 5

zero