### Genetics of Shell Banding and Color in *Capaea nemoralis***Problem 3:**In the snail *Capaea nemoralis*, an autosomal allele causing a banded shell (\( B^B \)) is recessive to the allele for an unbanded shell (\( B^0 \)). Genes at a different locus determine the background color of the shell: yellow (\( C^Y \)) is recessive to brown (\( C^{Bw} \)).- A banded, yellow snail is crossed with a homozygous brown, unbanded snail. - The \( F_1 \) generation are then crossed with banded, yellow snails, in what is known as a test cross.**Question a:**- What will the results of the test cross be if the loci that control banding and color are linked with no crossing over?

The banding and colour are linked genes on the same chromosome. But there are no crossing overs.

Answered: 3) In the snail Capaea nemoralis, an…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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In cucumbers: warty (T) > smooth (t) dull (D) > glossy (d) warty, dull x smooth, glossy P: TTDD X ttdd F1: warty, dull x smooth, glossy TtDd x ttdd If RF between T and D loci known to be 24%, how many total non- recombinant progeny do you expect out of 200 total progeny?
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In humans, ABO blood types refer to glycoproteins in the membranes of red blood cells. There are three alleles for this autosomal gene: IA, IB, and i. The IA allele codes for the A sugar, The IB allele codes for the B sugar, and the i allele doesn't code for any sugar. IA and IB are codominant, and i is recessive to both IA and IB. If an individual with type AB blood has a child with an individual with type O blood, what blood types could their children possibly have?
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An AABB zebra fish is crossed with an aabb zebra fish. (A) is the dominant allele and (a) is the recessive allele of an autosomal gene. Similar relations exist between (B) and (b) alleles of another fish autosomal gene, at a different locus. The F1 are crossed with a homozygote recessive. a)What will be the results of the testcross and the progeny ratios if genes A and B are completely linked? b)What will the results of the testcross be if the loci assort independently? c) What will the results of the testcross be if the loci are linked with a certain recombination (crossing over) frequency?

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