CONCEPT CHECK 14.2 1. For any gene with a dominant allele A and recessive allele

Question

CONCEPT CHECK 14.2 1. For any gene with a dominant allele A and recessive allele a, what proportions of the offspring from an AA × Aa cross are expected to be homozygous domi- nant, homozygous recessive, and heterozygous? 2·Two organisms, with genotypes BbDD and BBDd, are mated. Assuming independent assortment of the B/b and Did genes, write the genotypes of all possible offspring from this cross and use the rules of probability to calcu- late the chance of each genotype occurring. 3. WHAT IF?> Three characters (flower color, seed color, and pod shape) are considered in a cross between two pea plants: PoYyli × ppYW. what fraction of offspring is predicted to be homozygous recessive for at least two of the three characters?

Explanation / Answer

According to the Chegg guidelines I'll answer the first question when more than one question is posted. Post them separately to get the answers.

1) From the AA the allele produced is A and from Aa, two alleles are produced that is A and a.

So, the progeny either will have AA or Aa.

AA is homozygous dominant and Aa is heterozygous.

From the cross homozygous recessive is not possible because only one parent has recessive allele a.

So, the 1/2 will be homozygous dominant and 1/2 will be heterozygous.

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