Which of the following is NOT true about
meiosis?
a. it produces eggs and sperm in all
eukaryotes
b. it is a nuclear division
c. it halves the chromosome number
d. it is not done by prokaryotes
e. more than one of these is NOT true
A
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Some heterotrophic organisms actually contain vestigial chloroplasts
A. true B. false
Which hormone is NOT produced by the anterior pituitary gland?
A. prolactin B. luteinizing hormone C. calcitonin D. growth hormone
Congenital deafness in humans is due to the homozygous condition of either of the recessive genes d
or e, or both of these genes. Both dominant D and E are necessary for normal hearing. Gene D/d affects the middle ear, while gene E/e affects the inner ear. It does not matter how good the normal inner ear (as indicated by E__) is; if there is something wrong in the middle ear, the individual is unable to hear. The same applies for the other gene. Give the phenotypic results of the following crosses: (a) Dd EE ? Dd EE (b) Dd Ee ? Dd Ee (c) dd EE ? DD ee (d) Dd EE ? Dd ee (e) Dd EE ? DD Ee What will be an ideal response?
Embryonic cell cycles allow the rapid division of cells in the early embryo. These mitotic cell cycles are much shorter in length than the mitotic cell cycles of cells in a mature organism. In the embryonic cell cycles, mitosis takes approximately the same amount of time as it does in the cell cycles of mature cells. What do you think is a result of the embryonic cycle?
A. Resulting daughter cells do not contain the same genetic information as the mother cell in the embryonic cell cycles. B. Mother cells in the embryonic cell cycle spend the majority of their time in G0. C. Resulting daughter cells cannot form a mitotic spindle in the embryonic cell cycle. D. Resulting daughter cells are smaller than the mother cell in the embryonic cell cycles.