One form of hemophilia is caused by a sex-linked recessive gene. Assume that a man with hemophilia marries a phenotypically normal woman whose father had hemophilia. What is the probability that their first son will have hemophilia?

A) 1/16 B) 1/2 C) 1/4 D) 3/4 E) 1/8


Answer: B

Biology & Microbiology

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In the ovary, an egg (oocyte) and its surrounding cells form a ______.

A. follicle B. corpus luteum C. oviduct D. endometrium

Biology & Microbiology

In the fruit fly Drosophila, there is a dominant gene for normal wings and its recessive allele for vestigial wings. At another gene locus on the same chromosome, there is a dominant gene for red eyes and its recessive allele for purple eyes. A male that was heterozygous at both gene loci was mated with a female that was homozygous for both recessive alleles and the following results were observed among the offspring:Normal wings and red eyes - 420Vestigial wings and red eyes - 80Normal wings and purple eyes - 70Vestigial wings and purple eyes - 430According to these data, what is the distance, in centimorgans, between these 2 gene loci? (Enter the number only without the units. For example, 100 cM would be entered as 100) 

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Some of the fluid that leaks out of the capillaries is pulled back nearer to the end of the capillary bed by:

A) low interstitial fluid pressure. B) higher blood pressure in the capillaries. C) suction from valves. D) higher osmotic pressure in the capillaries.

Biology & Microbiology

The cells that line organs that must contain fluids, such as the intestine or bladder, are held together by _____ junctions

adhesion gap neuroglial tight

Biology & Microbiology