Question

In: Biology

Scalloped (sd) wing is an X-linked recessive and ebony (e) body color is an autosomal recessive...

Scalloped (sd) wing is an X-linked recessive and ebony (e) body color is an autosomal recessive mutation in Drosophila. What proportion of scalloped, ebony colored females is expected in the F2 starting with a true breeding scalloped female which is wild type for ebony mating with a true breeding male mutant only for ebony.

a.

1/16

b.

3/16

c.

0

d.

1/8

e.

1/32

Expert Solution

Xs = Allele for scalloped wing

X = Allele for normal wing

Ae = Allele for ebony body color

A = Allele for WT body color

Both these mutations are recessive.

Scalloped wing phenotype is X-linked.

Ebony body color is autosomal.

Parental cross: XsXs AA X XY AeAe

Gametes: (XsA) X (XAe) (YAe)

F1 Progeny: XsXAAe XsYAAe

F1 cross: XsXAAe X XsYAAe

Gametes: (XsA) (XsAe) (XA) (XAe) X (XsA) (XsAe) (YA) (YAe)

	(XsA)	(XsAe)	(XA)	(XAe)
(XsA)	XsXsAA – F/s/W	XsXsAAe- F/s/E	XsXAA – F/S/E	XsXAAe – F/S/E
(XsAe)	XsXsAAe – F/s/E	XsXsAeAe – F/s/e	XsXAAe – F/S/E	XsXAeAe – F/S/e
(YA)	XsYAA – M/s/E	XsYAAe- M/s/E	XYAA – M/S/E	XYAAe – M/S/E
(YAe)	XsYAAe – M/S/E	XsYAeAe – M/s/e	XYAAe – M/S/E	XYAeAe- M/S/e

F1 cross: XsXAAe X XsYAAe

Clue for phenotype:

F/S/E = Female-WT wing-WT body colour

F/s/e = Female-Scalloped-Ebony body colour

M/S/E = Male-WT wing-WT body colour

M/s/e = Male-Scalloped-Ebony body colour

Frequency of scalloped, ebony females = 1/16

gladiator answered 2 years ago

Scalloped (sd) is an X linked recessive and ebony (e) is an autosomal recessive mutation. What...

Scalloped (sd) is an X linked recessive and ebony (e) is an autosomal recessive mutation. What proportion of scalloped, ebony females (relative to whole population) is expected in the F2 starting with a true breeding scalloped female which is wile type for ebony mating with a true breeding male mutant only for ebony. PLEASE break this down step by step and simplify it please. All I know is the answer is 1/16... no idea how to get it.

In Drosophila , a recessive autosomal allele, ebony (e) produces a black body colour when homozygous....

In Drosophila , a recessive autosomal allele, ebony (e) produces a black body colour when homozygous. Another recessive autosomal allele, black (b) also produces a black body colour when homozygous. Wild type flies are grey. Flies with genotypes e/e b+/-, e+/- b/b, and e/e b/b show identical colour phenotype. If e/e b+/b+ ebony flies are crossed with e+/e+ b/b black flies than; c) What phenotypic ratios would be observed from the crosses F1 x true-breeding ebony, and F1 x true-breeding black? d) What would be...

Question 15 - Cystic fibrosis is transmitted as a(n): X-linked recessive gene autosomal recessive gene autosomal...

Question 15 - Cystic fibrosis is transmitted as a(n): X-linked recessive gene autosomal recessive gene autosomal dominant gene chromosomal defect

The yellow mutation is an X-linked recessive mutation in Drosophila, causing yellow body color. A yellow-bodied...

The yellow mutation is an X-linked recessive mutation in Drosophila, causing yellow body color. A yellow-bodied female is crossed to a male with wild type body color to produce F1 progeny. The F1 female progeny and F1 male progeny are then crossed to each other to produce F2 progeny. Among the F2 females A. all will be yellow body color. B. 3/4 will be yellow body color. C. 1/2 will be yellow body color. D. 1/4 will be yellow body...

Genetic Inheritance Patterns: Retinitis pigmentosa (RP) can be autosomal recessive, autosomal dominant, or x-linked

Genetic Inheritance Patterns: Retinitis pigmentosa (RP) can be autosomal recessive, autosomal dominant, or x-linked. Apparently the dominant forms are often less severe. Usher’s Syndrome is an autosomal recessive inheritance (i.e., you must get a copy of the defective gene from your Mom and one from your Dad). Autosomal means it is not carried on one of the chromosomes that determines sex. One website (http://www.emedicine.com/oph/topic704.htm) says that Usher’s Syndrome Type II has been mapped to chromosome arm 1qe. Usher’s Type II...

You are studying recessive mutations of three autosomal, linked genes in guinea pigs: fur color (y,...

You are studying recessive mutations of three autosomal, linked genes in guinea pigs: fur color (y, yellow); fur texture (wv, wavy); ear size (l, large). The data in columns A and B was obtained from crosses of heterozygous F1 females with homozygous testcross males (recessive for all three traits). Column: A B C D E F2 Phenotype # Observed Corresponding Genotype P or SCO or DCO Genotype Written in Correct Order on Homologs yellow 310 ywv+l+ P...

In Drosophila the recessive alleles for white eyes is X-linked (normal eye color is red) and...

In Drosophila the recessive alleles for white eyes is X-linked (normal eye color is red) and the recessive allele for vestigial wings is autosomal. A female heterozygous for both of these traits is crossed with a white-eyed vestigial male. What proportion of the FEMALE progeny will be white-eyed with vestigial wings.? (a) 100 % (b) 75 % (c) 50 % (d) 25 % (e) 0 %

The condition shown in this family has multiple possible modes of inheritance: X-linked recessive, autosomal dominant,...

The condition shown in this family has multiple possible modes of inheritance: X-linked recessive, autosomal dominant, and autosomal recessive. It is always one mode of inheritance for each family (ie it doesn't change between people within the same family). Assume full penetrance and onset from birth. You are trying to determine the mode of inheritance for the condition in this family. Regardless of the gene it's on, finding a single pathogenic mutation in who in this family (other than the...

Suppose colourblindness is an X-linked recessive trait, while Huntington's disease is an autosomal dominant trait. Assume...

Suppose colourblindness is an X-linked recessive trait, while Huntington's disease is an autosomal dominant trait. Assume both traits are rare. A colourblind man decides to have children with a women who is heterozygous for both genes. What is the probability that they will have a child that is colourblind and does not have Huntington's?

QUESTION 6 Red-Green colorblindness is a X-linked recessive disorder. Huntington’s is an autosomal dominant disorder. Susan’s...

QUESTION 6 Red-Green colorblindness is a X-linked recessive disorder. Huntington’s is an autosomal dominant disorder. Susan’s father is color blind and has Huntington’s disease and is heterozygous for the Huntington’s allele. Her mother is normal and has no history of colorblindness or Huntington’s in her family. Her brother has developed Huntington’s but is not colorblind. Her husband Greg is healthy and has no incidence of either disorder in his family. Susan is not colorblind and has not yet be tested...