In meiosis, when do cells become haploid?

A. After telophase I
B. After telophase II
C. During anaphase I
D. During anaphase II
E. After prophase II


A

Biology & Microbiology

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In the late 1960s, Carrell Williams and Karel Slama discovered that the insect Pyrrhocoris apterus, when grown in jars with paper towels made from balsam fir, underwent several extra larval molts and finally died without completing metamorphosis

Further investigation led to the conclusion that the fir trees synthesize a hormonal analog that acts as an insecticide. The molecule is actually an analog of juvenile hormone. Furthermore, the juvenile hormone analog discovered by Salma and Williams has no effect on most other metamorphosing insects, suggesting that: A. many insects reproduce as larvae. B. there has been some evolutionary divergence in the structure of juvenile hormone and in the juvenile hormone receptors of different insects. C. not all insects utilize juvenile hormone to stimulate metamorphosis. D. other insects have evolved methods to detect the juvenile hormone analog and are not found in balsam firs.

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The Order Primates had its origin in:

A. small arboreal monotremes B. bipedal marsupials C. small, arboreal, insect-eating mammals D. bipedal ornithischian dinosaurs E. theropods with hair

Biology & Microbiology

Define aneuploidy and describe the sex chromosome aneuploidies involved in Turner syndrome, Klinefelter syndrome, and XYY syndrome; list characteristics of each disorder

What will be an ideal response?

Biology & Microbiology

Sheree is referred to a genetic counselor because a cystic fibrosis (CF) test done as a routine part of her prenatal care indicated that she is a carrier of the most common mutant allele. Sheree is stunned, because no one in her family has the disease. She is 26 years old. The genetic counselor would most likely

A) explain autosomal recessive inheritance and suggest that Sheree's husband be tested for CF. B) explain autosomal dominant inheritance and suggest that Sheree's husband be tested for CF. C) explain autosomal recessive inheritance and suggest that Sheree's parents be tested for CF. D) advise Sheree to have amniocentesis to check the fetus for the CF genotype.

Biology & Microbiology