Frequent question: What combinations of alleles could result from a crossover?

What combinations of alleles could result from a crossover between BD and BD chromosome?

During crossing over, homologous chromosomes exchange genetic material. This is a form of recombination that increases genetic variability. For example, a cross-over between “BD” and “bd” chromosomes may result in either the “Bd” or “bD” alleles. Crossing over is one of three sources for increased genetic variation.

What possible combinations of alleles could it have?

The total possible combination of alleles for those genes in humans is approximately 70,368,744,177,664. This is trillions of times more combinations than the number of people who have ever lived. This accounts for the fact that nearly everyone, except monozygotic twins, is genetically unique.

What are the allele combinations?

Glossary:Allele Combination. A designation of the specific alleles present on the two homologous chromosomes for all relevant loci of a mouse (i.e., all allele pairs of a genotype). An allele combination can be composed of one or more allele pairs.

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Does crossing over mix up alleles?

Crossing over is when the two gene copies get mixed up to form new, different copies.

Can homologous chromosomes have different alleles?

Homologous chromosomes are made up of chromosome pairs of approximately the same length, centromere position, and staining pattern, for genes with the same corresponding loci. … The alleles on the homologous chromosomes may be different, resulting in different phenotypes of the same genes.

What are the two ways that meiosis contributes to genetic recombination?

3. Two ways Meiosis contributes to genetic recombination is that it ensures genetic diversity by a assortment of homologous chromosomes and crossing over process.

What are the 3 types of allele combinations an individual can have?

There are three different alleles, known as IA, IB, and i. The IA and IB alleles are co-dominant, and the i allele is recessive. The possible human phenotypes for blood group are type A, type B, type AB, and type O.

How many different combinations of alleles are possible among the gametes?

Since each parent has four different combinations of alleles in the gametes, there are sixteen possible combinations for this cross.

How does the allele segregation determine the allele combination?

When an organism makes gametes, each gamete receives just one gene copy, which is selected randomly. This is known as the law of segregation. A Punnett square can be used to predict genotypes (allele combinations) and phenotypes (observable traits) of offspring from genetic crosses.

How many combinations of 4 alleles are there?

4 alleles there are 1 + 2 + 3 + 4 = 10 genotypes.

What type of inheritance do two alleles have if their traits blend together?

One exception is incomplete dominance (sometimes called blending inheritance) when alleles blend their traits in the phenotype. An example of this would be seen if, when crossing Antirrhinums — flowers with incompletely dominant “red” and “white” alleles for petal color — the resulting offspring had pink petals.

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What are two genes mixed together called?


= Codominance is a relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent. If the alleles are different, the dominant allele usually will be expressed, while the effect of the other allele, called recessive, is masked.

When homologous chromosomes crossover What is the result?

Crossing over is a process that happens between homologous chromosomes in order to increase genetic diversity. During crossing over, part of one chromosome is exchanged with another. The result is a hybrid chromosome with a unique pattern of genetic material.

How does crossing over mix up alleles from your paternal and maternal chromosomes?

How does crossing over mix up alleles from your paternal and maternal chromosomes? It involves a physical exchange of segments from homologous chromosomes. … The dominant allele (A) codes for normal pigmentation, and the recessive allele (a) codes for no pigmentation.

What effect does crossing over have on linked genes?

Crossing over can put new alleles together in combination on the same chromosome, causing them to go into the same gamete. When genes are far apart, crossing over happens often enough that all types of gametes are produced with 25% frequency.