Questions: PROCEDURE 1. Most organisms are diploid; that is, they contain homologous chromosomes with genes for the same traits. The location of a gene on a chromosome is its locus (plural: loci). Two genes at homologous loci are called a gene pair. Chromosomes have numerous genes, as shown in Figure 13-1. Genes exist in different forms, called alleles. Let's consider one gene pair at the Flocus. There are three possibilities for the allelic makeup at the Flocus. Both alleles are FF: Both alleles are ff: One allele is F, and the other is f:

PROCEDURE
1. Most organisms are diploid; that is, they contain homologous chromosomes with genes for the same traits. The location of a gene on a chromosome is its locus (plural: loci). Two genes at homologous loci are called a gene pair. Chromosomes have numerous genes, as shown in Figure 13-1. Genes exist in different forms, called alleles. Let's consider one gene pair at the Flocus. There are three possibilities for the allelic makeup at the Flocus.

Both alleles are FF:

Both alleles are ff:

One allele is F, and the other is f:

Transcript text: PROCEDURE 1. Most organisms are diploid; that is, they contain homologous chromosomes with genes for the same traits. The location of a gene on a chromosome is its locus (plural: loci). Two genes at homologous loci are called a gene pair. Chromosomes have numerous genes, as shown in Figure 13-1. Genes exist in different forms, called alleles. Let's consider one gene pair at the Flocus. There are three possibilities for the allelic makeup at the Flocus. Both alleles are FF: Both alleles are ff: One allele is $F$, and the other is $f$ :

Solution

Solution Steps

Step 1: Define diploid

A diploid organism has two sets of chromosomes, one inherited from each parent. These chromosome pairs are called homologous chromosomes. They contain genes for the same traits at the same locations (loci), but the specific versions of the genes (alleles) can be different.

Step 2: Explain the three possibilities at the F locus

The prompt asks us to consider a gene at the F locus, which has two alleles: F and f. Since the organism is diploid, there are three possible combinations of these alleles:

FF: Both alleles are F (homozygous dominant).
ff: Both alleles are f (homozygous recessive).
Ff: One allele is F and the other is f (heterozygous).

Step 3: Describe the diagrams

The diagrams visually represent the three genotypes described above. Each diagram shows a portion of homologous chromosomes with the F locus marked. The shaded regions represent the alleles at that locus.

Final Answer:

The three possible allelic combinations at the F locus in a diploid organism are FF (homozygous dominant), ff (homozygous recessive), and Ff (heterozygous). The diagrams illustrate these genotypes by showing the alleles present on homologous chromosomes.

Was this solution helpful?

Unhelpful

Helpful

Questions asked by other users

< Previous Next >

Thank you for your feedback.

Copied!