Can you help me do a Punnett square?

Question

An organism with genotype BbDD is mated to one with genotype BBDd. Write the genotype for all possible offpsring. Can someone pleae explain to me HOW to do it?

Answer 1

You write all possible gene pairs for one parent along the top, and all pairs for the other parent at the left. For BbDD, the pairs are BD, BD, bD, and bD. For BBDd, the pairs are BD, Bd, BD, and Bd. Yes, you can't tell half the pairs from identical pairs, but they represent a different combination of genes, technically. This gives you a 4 x 4 Punnett square, with a total of 16 boxes. Then you write in what you get from the row and column. For example, a box with BD above it and Bd to the left gives you BBDd.

Answer 2

well to start off there are different types of punett squares- monohybrid where u are crossing one trait of each parent and a dyhibrid where u cross two traits of each parent. Bascially its one big square divided by four little ones on each side you put one trait they can be homozygous or heterozygous. homo- like homosexual (the same)BB or bb and hetero- (different) Bb.once they are lined up for example
B b
B BB Bb

B BB Bb

say Bb is brown eyes and and BB is blue eyes these peoples children have 50% of either being brown or blue eyed.