Two genes, A/a and B/b, control fruit color in squash. The inheritance pattern for this trait...

Two genes, A/a and B/b, control fruit color in squash. The inheritance pattern for this trait fits one of the multiple gene types that we discussed in class. A homozygous plant with white fruit was crossed with a homozygous plant with yellow fruit. All the progeny had red fruit. When two F1 plants were crossed, the F2 consisted of 38 white, 27 yellow, and 89 red.

(a) (2 pts) Which type of gene interaction do we see here? Explain your reasoning.

(b) (2 pts) What is the expected ratio of white to yellow to red fruit in the F2?

(c) (3 pts) What were the genotypes of the P generation plants?

(d) (5 pts) Test your hypothesized gene interaction model with Chi-square analysis. Please include all the components of Chi-square analysis in your answer.

(Continues on the back…)

(e) (5 pts) The diagram explains how the two genes interact at the molecular level. Compounds X, Y, and Z determine fruit color depending on which of the two chemical reactions occur. Each gene produces an enzyme that is either active or inactive depending on its genotype.

When an enzyme is active, the reaction it catalyzes occurs; when it is inactive, the reaction is blocked. Write in the boxes the genotypes that would explain the inheritance pattern.

(2 pts) Please fill in the box with the according genotypes.

(3 pts) Interpret the pathway with your own words (e.x. how to read this pathway? how you get white, yellow and red colors from different genotypes by following this pathway graph? Circle out the epistatic genotype in your pathway)

Expert Solution

gladiator answered 6 months ago

Not all genes display Mendelian inheritance, or X-linked inherence. Eye color is a polygenetic trait. Outline...

Not all genes display Mendelian inheritance, or X-linked inherence. Eye color is a polygenetic trait. Outline how polygenic characteristics are inherited. What are the ratios of inheritance for eye color? Write an in-depth paragraph explaining your answer.

Let’s model the inheritance of a genetic trait, for example eye color. Every individual has a...

Let’s model the inheritance of a genetic trait, for example eye color. Every individual has a pair of chromosomes for eye color, and an offspring gets one chromosome from each parent. Say a represents a brown-eye gene, and b represents a blue-eye gene, and that brown is dominant (meaning the eye will be brown if the individual carries at least one a gene, and only bb pair will result in blue eyes). The order in the pair does not matter....

In the common bluebell, two linked, autosomal genes control flower color and plant height. With the...

In the common bluebell, two linked, autosomal genes control flower color and plant height. With the given information, find the expected F1 generation phenotypes and the frequencies of the F1 generation. B (blue flowers) is dominant to b (white flowers) T (tall plants) is dominant to t (dwarf plants) If the crossover frequency between the two loci is 26%, what will the expected F1 phenotypes and their frequencies from the following cross: a) BT//bt x bt//bt b) Bt//bT x bt//bt...

Mendelian Genetics In tomato plants, the gene R has two alleles that control fruit color: the...

Mendelian Genetics In tomato plants, the gene R has two alleles that control fruit color: the R allele is dominant and produces red tomatoes; the r allele is recessive, and when homozygous produces yellow tomatoes. Gene T controls plant height: the T allele is dominant and produces tall plants; the t allele is recessive and when homozygous produces dwarf plants. Genes R and T undergo independent assortment. A. Parental tomato plants of genotype RRTT and rrtt are crossed. What genotype...

Three genes in fruit flies affect a particular trait, and one dominant allele of each gene...

Three genes in fruit flies affect a particular trait, and one dominant allele of each gene is necessary to get a wild-type phenotype. What phenotypic ratios would you predict among the progeny if you crossed triply heterozygous flies? Multiple Choice 27:64 9:23 37:64 1:3 27:37 3:5 1:7 Would the answer be 27:37 wild to mutant?

If 3 genes control one trait, how many different genotypes can occur?

Task- genetics The genes for body color (A), eye color (B) and wing length (C) are...

Task- genetics The genes for body color (A), eye color (B) and wing length (C) are linked to the same autosomal chromosome of D. melanogaster, in the order of A - B - C. For body color, alleles encode 'A +' for wild type and 'a' for black body; for eye color, alleles encode 'B +' for wild type and 'b' for pink eyes; For wing length, alleles code 'C +' for wild type and 'c' for short wings. Wild-type...

1.In fruit flies, eye color is an X-linked trait. Red eyes (XR) are dominant over white...

1.In fruit flies, eye color is an X-linked trait. Red eyes (XR) are dominant over white eyes (Xr)A homozygous dominant female mates with a white-eyed male. What is the phenotypic ratio among males? a.1:0 (all male offspring will have red eyes) b.1:1 (half of the male offspring will have red eyes and half will have white eyes) c.0:1 (all male offspring will have white eyes) 2.In fruit flies, eye color is an X-linked trait. Red eyes (XR) are dominant over...

You are examining two traits of a plant called Trait A and Trait B. Each trait...

You are examining two traits of a plant called Trait A and Trait B. Each trait is associated with a different gene on a different chromosome. Trait A shows: the same phenotype for both the heterozygous and homozygous dominant allele combinations a different phenotype for the homozygous recessive allele combination. Trait B shows: three different phenotypes, each associated with only one of the three possible allele combinations. A) Describe the type of inheritance associated with Trait A and describe the...

12. You have isolated two different mutations in squash plants. The first mutation causes fruit to...

12. You have isolated two different mutations in squash plants. The first mutation causes fruit to be white instead of green. The second mutation causes fruit to be yellow instead of green. The two mutations affect different genes, w(hite) and g(reen) respectively. The allele symbols for w are w+ (wildtype) and w (mutant). The allele symbols for g are g+ (wildtype) and g (mutant). When you conduct a dihybrid cross (w+/w;g+/g x w+/w;g+/g) you obtain the following phenotypic ratio: White...

Question