Question

er the green seed color (wy). You nine if the plant is YY 12) In peas, the yellow seed color is dominant (YY or Yy) over the green seed color have been given a plant that only produces vellow seeds and need to determine if or fy. Which of the following crosses would be most effective for determining the ben your plant? A)your plant x a plant that produces only green seeds B)your plant x another plant with known genotype YY C)your plant x another plant with known genotype Yy D)No cross is necessary. You should just plant your yellow seed and see what color flowers it produces. E)There is no way to determine the genotype of your plant.

Answer 1

ANSWER 1. Your plant * a plant that produces only green seeds

Here the explanation.

To determine the genotype of the progeny, the test cross has been performed in which heterozygote individual( progeny) and recessive homozygous (individual parent)crossed. The main purpose of a test cross is to determine if this progeny is homozygous dominant or heterozygous.

if we cross the YY or Yy( Yellow seed colour) and yy ( green seed colour), we will get the heterozygous Yy)individual.

If we cross Yy and yy, we will get the following progeny and following ratios:

The genotypes that we will get are - YY Yy Yy yy

Genotypic ratio - 1:2:1, 1 yellow seed plant: 2 yellow seed plant: 1 green seed plant

Phenotypic ratio - 3 yellow seed plant:1 green seed plant

so this test cross, makes us understand about the genotype of the F1 heterozygous individual could produce.

However, with the other options, we will not be able to tell the exact phenotype of the obtained progeny.

OPTION   B and C are kinds of part of the back cross which has been used to improve the trait of the individual. For example, we will back cross the progeny with the parent who will dominate and will have a better trait.

Options D and E do not apply, because the first option which is correct, counteract to these options