Question

Organisms with the genotypes AABbCcDd and AaBbCcDd are crossed. What are the expected proportions of the following progeny?A–B–C–D–

Accepted Answer

Step 1: Understand the problem. The genotypes AABbCcDd and AaBbCcDd represent the parental organisms. The goal is to determine the proportion of progeny with the genotype A–B–C–D–, where each dash (–) indicates that either the dominant or recessive allele is acceptable for that gene. Step 2: Break down the problem into individual loci (A, B, C, and D). For each locus, calculate the probability of obtaining at least one dominant allele (A–, B–, C–, D–) in the progeny. Use the rules of Mendelian inheritance to determine the probabilities for each locus. Step 3: For the A locus, the parental genotypes are AA (homozygous dominant) and Aa (heterozygous). The offspring will always inherit at least one dominant allele (A–), so the probability for A– is 1. Step 4: For the B locus, the parental genotypes are Bb (heterozygous) and Bb (heterozygous). Use a Punnett square to determine the probability of obtaining at least one dominant allele (B–). The probabilities are: BB = 1/4, Bb = 1/2, and bb = 1/4. Add the probabilities for BB and Bb to get the probability of B–. Step 5: Repeat the same process for the C and D loci. For the C locus, both parents are Cc (heterozygous), so use a Punnett square to calculate the probability of C–. For the D locus, the parental genotypes are Dd (heterozygous) and Dd (heterozygous). Multiply the probabilities for A–, B–, C–, and D– to find the overall proportion of progeny with the genotype A–B–C–D–.

Organisms with the genotypes AABbCcDd and AaBbCcDd are crossed. What are the expected proportions of the following progeny?

A–B–C–D–

비슷한 문제에 대한 검증된 영상 답변:

주요 개념

Genotype

Punnett Square

Independent Assortment