1. Are recessive alleles harmful? 2. Are all traits represented by only one gene? 3. In...

1. Are recessive alleles harmful?

2. Are all traits represented by only one gene?

3. In any given population, can there be more than two alleles present?

Solutions

Expert Solution

1) All recessive allels are not harmful. There are harmful recessive allels that can affect the organisms. But they only affect the organisms in a homozygous condition. In heterozygous condition they cannot affect the organisms since they are suppressed by the dominant gene. This allows the population to carry a recessive harmful allel from one generation to another.

2) No. All the traits are not represented by only one gene. The characters that are controlled by only one gene is called single gene traits. Attached earlobes (and free earlobes) is an example of single gene trait. There are polygenic traits in which a trait is controlled more than one gene. There are many examples for polygenic trait. Some of the common ones are , height in humans, blood group, eyecolour, skin colour etc.

3) In actual terms, a diploid individual posses only 2 allels for a particular trait or character. But in a population, there can be more than two allels for a character. For example, consider the allels that determine the blood group. In a population all the allels ie I^A, I^B, i can be present. But in a diploid individual only 2 of the allels will be present that determine his/her blood group.

gladiator answered 2 hours ago

Next > < Previous

Related Solutions

How are traits inherited? 1. Dominant/recessive (Mendelian) 2. Incomplete Dominance 3. Codominance 4. Multiple Alleles (ABO...

How are traits inherited? 1. Dominant/recessive (Mendelian) 2. Incomplete Dominance 3. Codominance 4. Multiple Alleles (ABO blood group) 5. Multiple Genes (including Epistasis)

A gene showing codominance- Select one: a. has alleles that are recessive to each other b....

A gene showing codominance- Select one: a. has alleles that are recessive to each other b. has alleles expressed at the same time in development c. has alleles tightly linked on the same chromosome d. has one allele dominant to the other e. has both alleles independently expressed in the heterozygote

In tomatoes, pear shape, yellow color, and terminal flower position are recessive traits produced by alleles...

In tomatoes, pear shape, yellow color, and terminal flower position are recessive traits produced by alleles f, r, and t, respectively. The dominant phenotypes for each trait – full shape, red color, and axial flower position- are the product of dominant alleles F, R, and T. A farmer has two pure breeding tomato lines. One is full, yellow, terminal, and the other is pear, red, and axial. Design a breeding experiment (a series of crosses) that will produce a line...

Why is it that lethal recessive alleles remain in the human gene pool, rather than just...

Why is it that lethal recessive alleles remain in the human gene pool, rather than just disappearing because of their unfavorable phenotype for homozygous recessives? Scenario: A sudden flood of a large area around the Mississippi River occurs. In some local populations of a species of insects, there is greater buoyancy and survival of some individuals due to having the double recessive genotype of a gene that allowed them to accumulate more lipids to float. A year after the flood,...

Why is it that lethal recessive alleles remain in the human gene pool, rather than just...

Choose one of the following traits (1) Dominant/recessive OR Codominant OR Incomplete dominance OR Sex-linked (2)...

Choose one of the following traits (1) Dominant/recessive OR Codominant OR Incomplete dominance OR Sex-linked (2) choose a trait that fits into that category that was not mentioned in the PPT (3) briefly describe the trait and (4) what is the current percentage of people that have this trait in the US.

In Genetics, it is known that the dominant and recessive traits show 3:1 ratio. A certain...

In Genetics, it is known that the dominant and recessive traits show 3:1 ratio. A certain flower has only two colors: white (dominant) and red (recessive), and a research observed colors of 100 flowers in a field. If he/she observed 67 white and 33 red. (a) Does this data support the claim in Genetics? (Use α = 0.1.) (b) Construct a 90% confidence interval for the proportion of white flowers. (c) Can we derived the conclusion of (a) based on...

1. you are evaluating autosomal recessive condition A (alleles A and a) and B (alleles B...

1. you are evaluating autosomal recessive condition A (alleles A and a) and B (alleles B and b) which you hypothesize are on different chromosomes. You are given 7 wildtype (homozygous dominant) female flies and 7 male flies that are homozygous recessive. What genotypic ratio would you expect in the F1 generation produced? 2. you mate the F1 females with males that are homozygous recessive for both disease A and B to produce an F2 generation. What phenotypic ratio would...

1. A gene can have many alleles. Why is it that any given person only carries...

1. A gene can have many alleles. Why is it that any given person only carries two copies of each allele? Pick one below This is a function of co-dominance, or incomplete dominance. During fertilization a gamete only contributes one allele from each parent. Chromosomes lose the extra alleles during cross over or recombination. Having more than one allele results in cell death. 2. The X-linked recessive trait of color-blindness is present in 5% of males. If a mother who...

2. Black bodies and vestigial wings in Drosophila are caused by recessive alleles on chromosome 2....

2. Black bodies and vestigial wings in Drosophila are caused by recessive alleles on chromosome 2. A long-winged male with yellow-brown body color, homozygous for the wild-type alleles, b+b+ v+v+, was exposed to X-rays to induce mutations in germ-line cells (i.e. to generate mutations in the gametes the male produced). He was then mated to a homozygous recessive black-bodied, vestigial-winged female, bb vv. Among the offspring, a male with a black body and vestigial wings was observed. a. What are...

Subjects