You Are Studying Body Color in an African Spider and Have

question 5

Multiple Choice

You are studying body color in an African spider and have found that it is controlled by a single gene with four alleles: B (brown) , b^r (red) , b^g (green) , and b^y (yellow) .B is dominant to all the other alleles, and b^y is recessive to all the other alleles.The b^g allele is dominant to b^y but recessive to b^r.You cross a pure-breeding brown spider with a pure-breeding green spider.Predict the phenotype of the progeny.

• A)Half brown, half green
• B)Three-fourths brown, one-fourth green
• C)All brown
• D)All green
• E)All yellow

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Definitions:

Sister Chromatids

Refers to two identical strands joined by a common centromere, formed from the replication of a chromosome during S phase of the cell cycle.

Gonadal Tissues

The tissues that compose the gonads, which are the primary reproductive organs (ovaries in females and testes in males), responsible for producing gametes and hormones.

Early Blood Cells

Precursors to mature blood cells, formed in the bone marrow from hematopoietic stem cells.

Polar Bodies

Polar bodies are small cells that are formed as byproducts during the oocyte (egg cell) maturation process, involved in the division of cytoplasm.