Question

A plant with orange-spotted flowers was grown in the greenhouse from a seed collected in the wild. The plant was self-pollinated and gave rise to the following progeny: 88 plants with orange-spotted flowers, 34 plants with yellow-spotted flowers, 32 plants with solid orange flowers, and 8 plants with solid yellow flowers.

a. (1 point) What can you conclude about the dominance relationships of the alleles responsible for flower color and pattern? How many genes are involved?



There are two genes involved, one for flower color and one for flower pattern. There are two alleles for the flower color gene, with the orange allele (Y) dominant to the yellow allele (y). There are two alleles for the flower pattern gene, with the spotted allele (R) dominant to the unspotted allele (r).



b. (1 point) What was the genotype of the original plant with orange-spotted flowers?



the original plant was heterozygous for both genes: YyRr



c. (3 points) On a separate sheet of paper, draw a diagram that illustrates what happened to these alleles during meiosis in the original plant. Clearly label:

(a) the meiotic divisions (i.e. meiosis I and meiosis II)

(b) the homologous chromosomes, sister chromatids, genes and alleles

(c) all the genetically different gametes that could form and how frequently each type should be observed.

Answer 1

A plant with orange-spotted flowers was grown in the greenhouse from a seed collected in the wild. The plant was self-pollinated and gave rise to the following progeny: 88 plants with orange-spotted flowers, 34 plants with yellow-spotted flowers, 32 plants with solid orange flowers, and 8 plants with solid yellow flowers.

a. (1 point) What can you conclude about the dominance relationships of the alleles responsible for flower color and pattern? How many genes are involved?

b. (1 point) What was the genotype of the original plant with orange-spotted flowers?

c. (3 points) On a separate sheet of paper, draw a diagram that illustrates what happened to these alleles during meiosis in the original plant. Clearly label:

(i) the meiotic divisions (i.e. meiosis I and meiosis II)

(ii) the homologous chromosomes, sister chromatids, genes and alleles

(iii) all the genetically different gametes that could form and how frequently each type should be observed

Answer:

Step-by-step explanation:

The question seeks to examine basic knowledge of the foundations of genetics.

1a. There are two genes involved in the dominance relationships of the alleles responsible for flower color and pattern, one serves the purpose of flower color and one for flower pattern. There are two alleles for the flower color gene, with the orange allele (Y) dominant to the yellow allele (y). It should be noted that two alleles are responsible for the flower pattern gene – with the spotted allele (R) dominant to the unspotted allele (r).

b. The genotype of the original plant is characteristically heterozygous for both genes: YyRr

c. The figure below shows how i, ii and iii relates under the law of independent assortment.

Answer 2

The question is a little poorly worded.

But nevertheless I can clarify some doubts about what was written:

In the case of self-pollination (self), it arose by means of a pollinating agent that promoted genetic exchanges with other plants. The genes that were united in this crop are the color or pigment of the flower and another with the type or flower shape

Step-by-step explanation:

For each gene there are two alleles, in the color allele you have two genes of different colors, this means that there are two possible phenotypic manifestations of two different genetic information, we can consider the allele that imposes the orange color that is dominant over the color yellow, and on the other hand we have the gene of the pattern or shape that these colors have, this gene presents two different options to manifest itself, that is, two different alleles, which one manifests as smooth and the other as stained.