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
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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
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).
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.
The cells that line organs that must contain fluids, such as the intestine or bladder, are held together by _____ junctions
adhesion gap neuroglial tight