In Drosophila, a narrow, reduced eye is called a bar-eye. It is due to a dominant X-linked allele (B),
while the full wild-type is due to the recessive gene (B+). Give the F1 and F2 genotypic and
phenotypic expectations of a cross of a homozygous wild-type female with a bar-eyed male. What will be an ideal response?
B+B+ ? BY ? F1: B+B wild female, B+Y wild male; F2: 1/4 BY bar male, 1/4 B+Y wild male, 1/4
B+B+ wild female, 1/4 B+B wild female
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All of the following are usually a part of the aging of reproductive systems EXCEPT
a. declining levels of estrogen. b. menopause. c. loss of sexual response. d. decreased fertility. e. declining testosterone levels.
Steroid hormones generally work by:
A) passing into the cell and attaching to receptors inside. B) attaching to membrane receptors and triggering chemical reactions. C) triggering an action potential in the cell. D) triggering an influx of potassium ions. E) stimulating endocytosis of hormones and receptors.
Dental caries are the most common human disease.
Answer the following statement true (T) or false (F)
Progression through the cell cycle requires a cyclin to bind to a Cdk because _________
(a) the cyclins are the molecules with the enzymatic activity in the complex. (b) the binding of a cyclin to Cdk is required for Cdk enzymatic activity. (c) cyclin binding inhibits Cdk activity until the appropriate time in the cell cycle. (d) without cyclin binding, a cell-cycle checkpoint will be activated.