In fruit flies, red eye color (R) is dominant over brown eye color (r). Two red-eyed fruit flies were mated and they  produced the following offspring: 73 red-eyed flies; 27 brown-eyed flies. In the offspring, what is the  approximate ratio of red-eyed to brown-eyed fruit flies?

In mice, black fur (W) is dominant over white fur (w), and black eyes are dominant (R) over red eyes (r).  The two genes are located on different chromosomes.A male mouse with black fur and black eyes mated with a female mouse with white fur and red eyes. Out of 64 offspring, 30 had black fur and black eyes, and 34 had white fur and black eyes. What is the genotype of the male parental mouse? Select one: a. WwRr b. WwRR c. WWRR d. WWRr

Fruit flies with one allele for curly wings (Cy) and one allele for normal wings (Cy+) have curly wings. When two curly-winged flies are crossed, 2/3 of the offspring have curly wings and 1/3 have normal wings. If a curly-winged fly is mated to a normal-winged fly, how many flies of each type would you expect among 180 offspring?

A green salamander is mated with a white salamander. In the offspring, 49% of their abies are green and 51% of the babies are white. What is the genotype of the green salamander?

Cock-feathering in chickens is a sex-limited trait, limited to the male sex. If two heterozygous chickens (a hen and rooster) were mated and produced 5 offspring, what is the probability that the offspring would include 2 hen- feathered females, 2 hen-feathered males, and 1 cock- feathered male (in any given order)?

Fruit flies (Drosophila) were mated. Cross #1 - 2 male red eyes (se+), wild wings(ap+) X 4 female red eyes (se+), wild wings(ap+) Cross #2 - 2 male sepia eyes(se-), apterous wings (ap-) X 4 female red eyes(se+), wild wings (ap+) Cross #3 - 2 male red eyes (se+), wild wings(ap+) X 4 female sepia eyes(se-), apterous wings(ap-) Cross #4 - 2 male sepia eyes(se-), apterous wings (ap-) X 4 female sepia eyes(se-), apterous wings(ap-) Write out a dihybrid cross and branch diagram for the F2 generation.

A genotypically wild-type fruit fly is crossed to a fly with homozygous recessive mutations in two different genes that result in a wingless and an eyeless phenotype. The F1 generation is 100% phenotypically wild type. Two of the phenotypically wild-type F1 flies are mated and the following offspring are observed in the F2 generation: Wild type: 367 Wingless (wg): 119 Eyeless (ey): 134 Eyeless, wingless (ey; wg): 52 Part 1 Assuming independent assortment, how many F2 offspring would be expected to be homozygous for the wingless mutation but have normal eyes? O224 O126 O 112 O 378 Part 2 How many degrees of freedom are there in the results of this cross? O0 O 1 02 03 O4

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In mice, black fur (W) is dominant over white fur (w), and black eyes are dominant (R) over red eyes (r).  The two genes are located on different chromosomes.A male mouse with black fur and black eyes mated with a female mouse with white fur and red eyes. Out of 64 offspring, 30 had black fur and black eyes, and 34 had white fur and black eyes. A male mouse heterozygous for both fur and eye colour mated with a female mouse heterozygous for both traits.Out of 64 offspring, how many mice can be expected to be heterozygous for both fur and eye colour? Select one: a. 16 b. 12 c. 36 d. 1 e. 48 f. 4

A purebred brown mouse is repeatedly mated with a purebred white mouse, and all their offspring are brown. If two of these brown offspring are mated, what fraction of the F2 mice will be brown?