1. Within a pair of homologous chromosomes, recombination affects the allele com

Question

1. Within a pair of homologous chromosomes, recombination affects the allele combinations on all four chromatids.
1.Yes 2.No
2.Recombination occurs at a different place in each cell.
1.Yes 2.No
3.Gene loci A and B are on the same chromosome. During meiosis, recombination will always occur between these loci.
1.Yes 2.No
4.If two genes are on different chromosomes, a heterozygote produces four gametes types because of:
1. Independent assortment 2. Recombination
5.In a heterozygote, independent assortment produces four gamete types:
1. In equal frequency 2. With >50% of parental types and <50% of recombinant types
6.If two genes are incompletely linked, a heterozygote produces four gametes types because of:
1. Independent assortment 2. Recombination
7.In a heterozygote, recombination produces four gamete types:
1. in equal frequency 2. with >50% of parental types and <50% of recombinant types

Explanation / Answer

Ans.

1 Yes, alleles are the alternative versions o the same gene or DNA sequences that code for the same physical characteristics. the various alleles relative to the specific trait are only different from one another and they are always found at the same location within an organism DNA. Therefore, during homologous recombination, the allele combination can result in the exchange of gene between chromosome.

2. Recombination occurs at a different place in each cell.

yes, the homologous recombination occurs at a different place. In a eukaryotic cell, its take place in the nucleus while in a Prokaryotic cell te conjugation that is similar to recombination in the cytoplasm. some recombinations are site-specific

3. Yes, During meiosis, recombination will always occur between the different loci on the same chromosome (homologous), therefore Gene loci A and B are on the same chromosome sow recombination.

4. If two genes are on different chromosomes, they assort independently and produce produces four types of gametes because of the genes on separate chromosomes assort independently and show the random orientation of homologous chromosome pairs during meiosis.

5. In a heterozygote, independent assortment produces four gamete type with equal or 25 % frequency because when the genes go into gametes, the allele received for one gene cannot affect the allele received from another gene of double heterozygote organism.

6. If genes are linked then a heterozygote producs for gamets type because of recombination. when genes are very near on the same chromosome, crossing over stioo occur but the outcome is different. Instead of assorting independently they move together during meiosis.

7.In a heterozygote, recombination produces four gamete types:
with >50% of parental types, in this condition gametes types are present in unequal proportions. The most types of the gamets contain parental patterns of all alleles and rare types of gametes contain recombinant patterns of alleles.

Now, we see gamete types that are present in very unequal proportions. The common types of gametes contain parental configurations of alleles—that is, the ones that were already together on the chromosome in the organism before meiosis (i.e, on the chromosome it got from its parents). The rare types of gametes contain recombinant configurations of alleles, that is, ones that can only form if a recombination event (crossover) occurs in between the genes.

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