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The length of the index finger is sex-influenced. The shortallele is dominant in males, whereas the long allele is dominant infemales. If a male with long index fingers and a female with shortindex fingers have offspring together, what are the possiblephenotypes of the offspring?

a) males with long index fingers and females with short indexfingers
b) males with long index fingers and females with long indexfingers
c) males with short index fingers and females with short indexfingers
d) males with short index fingers and females with longindex fingers

d) is the answer. Can someone explain why? Icant understand how to set up the question.

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Elin Hessel
Elin HesselLv2
28 Sep 2019
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Drosophila has four pairs of chromosomes: the sex chromosomes(XX in the females; XY in the males) and three pairs of autosomes.You are studying a new mutant strain with blue eyes. You wish toknow if blue eye colour is a dominant mutation and on whichchromosome the blue eye locus can be found. When you cross apure‐breeding female blue‐eyed fly with vestigial wings andspineless bristles to a male fly with wild type eye colour, wings,and bristles, all of the F1 progeny are completely wild type. An F1male is backcrossed to a triple mutant female, producing thefollowing progeny (remember that there is no crossing over inDrosophila males):

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1- Is the mutation dominant or recessive?Explain.

2-Since you know that the locus for vestigial wings is onchromosome 2 and the locus for spineless bristles is on chromosome3, what chromosome carries the locus for blue eyes? Show your work,including the step‐by‐step reasoning you used to arrive at youranswer.

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Wild type eyes and bristles, vestigial: 83 females, 98 males

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Wild type wings, blue eyes, spineless: 92 females, 88 males

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Wild type bristles, vestigial, blue eyes: 33 females, 37males

Blue eyes, spineless, vestigial: 90 females, 85 males

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According to the multiplication rule of probability, the chance of crossing two pea plants that are heterozygous for height and have none of four offspring showing the recessive short phenotype is:A. ¼ × ¼ × ¼ × ¼.

B. ¾ × ¾ × ¾ × ¾.

C. (¼ × ¼ × ¼ × ¼) + (¾ × ¾ × ¾ × ¾).

D. ¼ + ¼ + ¼ + ¼.

E. None of the above.

What characteristic is exhibited by an X-linked trait?

a) Only females have the trait.
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d) Males inherit X-linked traits from their paternal parent only.

e) Males can inherit a gene for an X-linked trait from either parent but normally inherit it from their fathers.
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Females inherit X-linked traits from their maternal parent only.
Females can inherit a gene for an X-linked trait from either parent.
Males inherit X-linked traits from their paternal parent only.
Males can inherit a gene for an X-linked trait from either parent but normally inherit it from their fathers.
Males can inherit a gene for an X-linked trait from either parent but normally inherit it from their fathers.

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