A Mendelian cross for a three-gene trait is expected to yield ________ F2 genotypes
A) 4
B) 16
C) 27
D) 64
E) 265
C
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Haploid Cells
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At what stage of mitosis do sister chromatids become full-fledged chromosomes?
A. cytokinesis B. telophase C. anaphase D. metaphase E. prophase
Many of the color varieties of summer squash are determined by several interacting loci: AA or Aa gives white, aaBB or aaBb gives yellow, and aabb produces green. Assume that two fully heterozygous plants are crossed
Give the phenotypes (with frequencies) of the offspring.
Assume that you are told that a particular organism, Drosophila, has the XO chromosome complement. You are also told that the autosomal complement is a normal 2n. You know that in humans the XO complement is female determining. Would you be correct in
assuming that the Drosophila sex for XO is also female? Choose the answer that includes the correct explanation. A) Yes, the presence of an X chromosome determines a female in both organisms. B) Yes, because sex determination in humans and insects is essentially the same. C) No, the chromosomal basis for sex determination in Drosophila is based on the balance between the number of X chromosomes and haploid sets of autosomes. D) No, it takes two X chromosomes to produce a female in humans and a Y chromosome to produce a male in Drosophila. E) No, sex determination in Drosophila is dependent on the presence or absence of the Y chromosome.