[Answer] Which diagram shows a homologous chromosome pair that has homozygous alleles?

Answer: D
Which diagram shows a homologous chromosome pair that has homozygous alleles?

The additional 23rd pair is the sex chromosomes X and Y.The 22 pairs of homologous chromosomes contain the same genes but code for different traits in their allelic forms since one was inherited from the mother and one from the father. So humans have two homologous chromosome sets in each cell meaning humans are diploid organisms.

Each chromosome in the pair contains the same genes in the same order and place along the length of the chromosome . For a given gene if the two chromosomes contain the same allele they and the organism are homozygous with respect to that gene. If the alleles are different they and the organism are heterozygous with respect to that gene.

Allele – Wikipedia

Allele – Wikipedia

Chromosome segregation – Wikipedia

In genetics dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome . The first variant is termed dominant and the second recessive.This state of having two different variants of the same gene on each chromosome is originally caused by a mutation in one of the genes either …

Chromosome segregation is the process in eukaryotes by which two sister chromatids formed as a consequence of DNA replication or paired homologous chromosomes separate from each other and migrate to opposite poles of the nucleus.This segregation process occurs during both mitosis and meiosis. Chromosome segregation also occurs in prokaryotes.However in contrast to eukaryotic chromosome …

Chromosomal crossover or crossing over is the exchange of genetic material during sexual reproduction between two homologous chromosomes non-sister chromatids that results in recombinant chromosomes .It is one of the final phases of genetic recombination which occurs in the pachytene stage of prophase I of meiosis during a process called sy…

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