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Dmitry [639]
3 years ago
10

Several students were having a discussion about the role of chromosomes in inheriting traits.

Biology
1 answer:
serious [3.7K]3 years ago
7 0

Answer:

Chromosomes are the structures found in the nucleus of a cell. They are made from DNA, containing hereditary information in the form of genes that control how an organism will look and behave.  

Chromosomes come in homologous pairs (one from each parent) that each contain thousands of genes, determining traits expressed in the offspring.

Explanation:

Chromosomes are the structures found in the nucleus of a cell. They are made from DNA, containing hereditary information in the form of genes that control how an organism will look and behave.  - this is true. Prior to cell division, DNA molecules are organized into large structures called chromosomes. Specific regions of a DNA molecule are called genes. These dictate specific proteins which control our traits.

Genes contain thousands of chromosomes that carry specific information about building proteins for a particular trait.  - this is false - genes are segments of DNA that control specific traits by dictating the structure and functions of proteins. Chromosomes contain thousands of genes

Chromosomes are small sections of DNA that contain specific information about a trait to build proteins that people inherit. The thousands of different chromosomes passed from the parents allow for humans to look uniquely different. - this is false - chromosomes are large structures, genes are the relatively small sections of DNA. Humans have 23 pairs of chromosomes, not thousands.

Chromosomes come in homologous pairs (one from each parent) that each contain thousands of genes, determining traits expressed in the offspring.  - this is true. In diploid organisms, like humans, have two copies of each chromosome. These chromosomes contain slightly different versions of genes, which make us unique.

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A vestigial-winged, hairy male is crossed with a wild-type female, homozygous at both genes. This F1 generation is crossed to pr
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Answer:

The expected proportion of F2 individuals which are homozygous recessive at both genes is 1/16

All of the F1 generation will have the normal phenotypes for both genes

There will be no homozygous individuals in the F1 generation

Most of the F2 generation will have the normal phenotypes for both genes

Explanation:

A winged hairy male is crossed with a wild type female which is homozygous

Let the allele for vestigial trait be v

allele for wild trait be w

allele for hairy trait be h

Allele for non hairy be n

The genotype of parents would be

vvhh * wwnn

Thus in F1 generation all the offsrping will have  normal phenotypes for both genes

In F2 generation

vwnh * vwnh

Out of 16 offspring only one wil be homozygous recessive i,e

wwnn

Rest all 15 will have normal phenotypes.

Hence, the correct answer is

The expected proportion of F2 individuals which are homozygous recessive at both genes is 1/16

All of the F1 generation will have the normal phenotypes for both genes

There will be no homozygous individuals in the F1 generation

Most of the F2 generation will have the normal phenotypes for both genes

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Explanation:

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