Question

A diagram of a 2N = 4 cell in metaphase I of meiosis.

The cell must have two genes (G and H). The two genes are on THE SAME CHROMOSOME.
This is the genotype: Hg/ hG
Label all the alleles.
Draw a single crossing over event between genes H and G.

Answer 1

In metaphase I of meiosis, homologous chromosomes line up in pairs in the middle of the cell. The random assortment of chromosomes leads to new combinations of alleles in gametes. A single crossing over event can result in recombinant chromosomes with new combinations of alleles.

Step-by-step explanation:

In metaphase I of meiosis, the homologous chromosomes line up in pairs in the middle of the cell. The chromosomes from the mother and father can each attach to either side of the spindle, and their attachment is random. This leads to new combinations of alleles on the resulting chromosomes, which are called gametes.

In the given genotype Hg/hG, the alleles can be labeled as:

- Hg represents the allele for gene H on one homologous chromosome.

- hG represents the allele for gene G on the other homologous chromosome.

To draw a single crossing over event between genes H and G, imagine that a crossing over event occurs between the chromatids of the homologous chromosomes during prophase I. This leads to the exchange of DNA segments between the chromatids, resulting in recombinant chromosomes with new combinations of alleles.