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After fertilization, the trophoblastic blastocyst produces ______ so that progesterone levels remain high enough to maintain the endometrium (uterine lining)
HCG, corpus luteum
Between weeks 12-14 of a pregnancy, progesterone is no longer produced by the _____ but is produced by the _____ instead.
corpus luteum, placenta
A condition when a diploid organism has different allelic forms of a particular gene is the definition of a:
The discharge of blood during menstruation of the human female indicates
Wall of the uterus is being shed
The failure of chromosome and/or chromatids to separate normally during m-something can cause:
Extra chromosomes in gametes AND gametes lacking chromosome AND Down's syndrome
Fertilization of the human egg occurs:
After the lining of the uterus is thicker and filled with blood AND after ovulation
The genotype of an individual with a dominant phenotype can be determined by
Test cross AND cross with an individual with the recessive phenotype
In humans, normal skin color is dominant to albino skin; a cross between two albino people results in:
All albino offspring
In the normal ovarian cycle, the endometrium continues its growth and is maintained in its thickened condition by the presence of
The pill prevents conception most likely by:
altering the hormone level of the female and inhibiting ovulation
The probability of parents with the genotypes (Mm) x (Mm) having an offspring with the genotype (mm) is:
The time of menstrual flow, or period, in a normal human female occurs:
Approximately two weeks after the egg is released from the ovary
Tubal ligation and vasectomies do not interfere with normal sex drive since:
hormone production is unchanged
Which of the following statements is correct for both spermatogenesis and oogenesis?
They produce haploid (n) cells
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