Is this correct? In pea plants, the allele for green pods is G. The allele for yellow pods is g. In the offspring 27 (75 percent) had green pods and 9 (25 percent) had yellow pods. What are the parents genotypes? How do you know? The parents genotypes are GG and gg. Because the dominant allele masked the recessive allele. In the offspring, 3/4 were green and 1/4 were yellow. The green pea pod masked the yellow pea pod.
Looks good to me
It does NOT look good to me. From your answer all the children would be Gg genotype. Both parents need to be heterozygous for that trait to get the percentages of offspring described. Do a Punnett square.
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Yes, you are correct. The parents' genotypes are GG and gg. This is evident from the fact that in the offspring, 27 out of 36 (or 75%) had green pods, which means they inherited the dominant allele G from one parent. Similarly, 9 out of 36 (or 25%) had yellow pods, indicating they inherited the recessive allele g from the other parent. Therefore, the dominant allele G masks the expression of the recessive allele g in the pea plant's phenotype.
Yes, that is correct.
To determine the genotypes of the parents, we need to observe the phenotype of the offspring and use the principles of Mendelian genetics.
In this case, the phenotypes of the offspring are 75% green pods and 25% yellow pods. From this information, we can infer that green pods are the dominant trait, and yellow pods are the recessive trait.
Let's break it down:
- The offspring genotype ratio is 3:1 for green pods to yellow pods. This means that out of every four offspring, three have the dominant trait (G), and one has the recessive trait (g).
- If we consider the dominant trait as G and the recessive trait as g, we can conclude that the offspring heterozygotes (Gg) have the genotype ratio of 2:2.
- Since all of the yellow pods are recessive, the genotype of the yellow pods (gg) can be determined from the 25% of offspring.
- Therefore, the parents genotypes can be deduced. One parent must have the genotype GG, because all of the offspring with green pods are dominant homozygotes (GG). The other parent must have the genotype gg because all of the offspring with yellow pods are recessive homozygotes (gg).
So, the parents genotypes are GG (for the parent that passed on the dominant allele) and gg (for the parent that passed on the recessive allele).
In summary, by observing the phenotype ratio of the offspring, we can deduce the genotypes of the parents.