[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 …

Mon Mar 15 2004 13:30:00 GMT-0500 (Eastern Standard Time) · The Punnett square is a square diagram that is used to predict the genotypes of a particular cross or breeding experiment. It is named after Reginald C. Punnett who devised the approach. The diagram is used by biologists to determine the probability of an offspring having a particular genotype. The Punnett square is a tabular summary of possible combinations of maternal …

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 meio…

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