You have stumbled on a new species of fly (order Diptera), and being a geneticist, you have already deritifled a few genes and observed an unusual phenotypic inheritance pattern. You have noticed that some flies have wings pointing forward and other flies have wings pointing backward. Digging in a bit deeper, you discover that the gene wing direction will controls which direction the wings point, and that if you cross homozygous backward-wing mother (wdir wall with a homozygous forward-wing father (wdir wer), all of the offspring (wdir wdin) have backward wings. When you perform the reciprocal cross, a homozygous forward-wing mother (wdi wdld with a homozygous backward-wing father (wdir wald, you observe that all of the offspring (wair wdir) have forward-facing wings. How would you account for this bizarre genotype phenotype relationship? a. Wing direction exhibits codominance where both phenotypes are represented equally b. The wdr gene is pleiotropic and affects multiple characteristics of the offspring causing the strange genotype phenotype relationship c. Wing direction is affected by something in the environment and is therefore an epgenetic trail Only the matemal gene for wing direction is being expressed due to genomic imprinting that silences the paternal gene during gamete formation d. Wing direction is obeying Mendes tws of independent assortment and segregation, therefore there is a 50/50 chance that wings will taco forward or backward in each offspring

Question

25-07-2022
Biology

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You have stumbled on a new species of fly (order Diptera), and being a geneticist, you have already deritifled a few genes and observed an unusual phenotypic inheritance pattern. You have noticed that some flies have wings pointing forward and other flies have wings pointing backward. Digging in a bit deeper, you discover that the gene wing direction will controls which direction the wings point, and that if you cross homozygous backward-wing mother (wdir wall with a homozygous forward-wing father (wdir wer), all of the offspring (wdir wdin) have backward wings. When you perform the reciprocal cross, a homozygous forward-wing mother (wdi wdld with a homozygous backward-wing father (wdir wald, you observe that all of the offspring (wair wdir) have forward-facing wings. How would you account for this bizarre genotype phenotype relationship? a. Wing direction exhibits codominance where both phenotypes are represented equally b. The wdr gene is pleiotropic and affects multiple characteristics of the offspring causing the strange genotype phenotype relationship c. Wing direction is affected by something in the environment and is therefore an epgenetic trail Only the matemal gene for wing direction is being expressed due to genomic imprinting that silences the paternal gene during gamete formation d. Wing direction is obeying Mendes tws of independent assortment and segregation, therefore there is a 50/50 chance that wings will taco forward or backward in each offspring

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marianaegarciaperedo marianaegarciaperedo · Answer 1 · 2022-08-03T18:39:26+02:00

Genomic imprint is the inactivation or silencing of one allele while the other one is still expressed. Option D). Only the maternal gene for wing direction is being expressed due to genomic imprinting.

What is the genomic imprint?

Genomic imprint or allele inactivation is the process through which one of the alleles of a gene (the one coming from the mother or the father) is suppressed, and only the other allele can be expressed.

This is not a mutation but a silencing effect due to other external factors. The unequal functional paternal and maternal genomes characterize the Genomic imprint pattern.

In the exposed example, Males' chromosomes are inactive or imprinted and have a different function from those females' chromosomes.

This is a common pattern in some mammals, insects, and angiosperms. The paternal allele can not be expressed, which causes an unequal contribution to the phenotype of the progeny.

Available data:

Diallelic Gene: Wdir ⇒ controls the direction of the wing
wdir wdir ⇒ backward
wdir-wdir- ⇒ forward
wdir wdir- ⇒ backward or forward

1st cross:

Parentals) wdir wdir female (backward) x wdir- wdir- male (forward)

F1) 100% wdir wdir- (backward)

2nd cross:

Parentals) wdir wdir male (backward) x wdir- wdir- female (forward)

F1) 100% wdir wdir- (forward)

In both cases, the offspring is heterozygous for the trait but expresses the female's phenotype.

Only the maternal gene for wing direction is being expressed due to genomic imprinting that silences the paternal gene during gamete formation. Option D) is correct.

You can learn more about genomic imprint at

https://brainly.com/question/14353069

https://brainly.com/question/21852103

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You have stumbled on a new species of fly (order Diptera), and being a geneticist, you have already deritifled a few genes and observed an unusual phenotypic inheritance pattern.

You have noticed that some flies have wings pointing forward and other flies have wings pointing backward. Digging in a bit deeper, you discover that the gene wing direction (Wdir) will controls which direction the wings point, and that

if you cross homozygous backward-wing mother (wdir wdir) with a homozygous forward-wing father (wdir- wdir-), all of the offspring (wdir wdir-) have backward wings.

if you perform the reciprocal cross, a homozygous forward-wing mother (wdir- wdir-) with a homozygous backward-wing father (wdir wdir), you observe that all of the offspring (wdir wdir-) have forward-facing wings.

How would you account for this bizarre genotype phenotype relationship?

Multiple Choice

a) Wing direction exhibits codominance where both phenotypes are represented equally

b) The wdir gene is pleiotropic and affects multiple characteristics of the offspring causing the strange genotype phenotype relationship

c) Wings direction is affected by something in the environment and is therefore an epgenetic trail

d) Only the maternal gene for wing direction is being expressed due to genomic imprinting that silences the paternal gene during gamete formation

e) Wing direction is obeying Mendes tws of independent assortment and segregation, therefore there is a 50/50 chance that wings will taco forward or backward in each offspring.