Sexual life cycles and Meisos

9 important questions on Sexual life cycles and Meisos

Which of the following statements about homologous chromosomes is correct?

They have genes for the same traits at the same loci

Which event occurs only during prophase I of the first meiotic division?

Synapsis of homologous pairs occurs

Which of the following contributes to genetic variation in sexually reproducing species?

random fertilization, independent assortment, crossing over
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In humans, the haploid number of chromosomes is 23. Independent assortment has the possibility of producing __________ different types of gametes.

2^23

In a diploid set of chromosomes, one member of each pair of homologous chromosomes is derived from the father (paternal), and the other comes from the mother (maternal). If 2n = 6, what is the probability that a particular gamete will contain only paternal chromosomes?

1/8

Which of the following answers is NEITHER involved with crossing over NOR an outcome of crossing over?

the random alignment of homologous pairs of chromosomes at metaphase I

Which of these cells are haploïd

C and D

A diploid organism whose somatic (nonsex) cells each contain 32 chromosomes produces gametes containing _____ chromosomes.

16


Assume that an organism exists in which crossing over does not occur, but that all other processes associated with meiosis occur normally. Consider how the absence of crossing over would affect the outcome of meiosis.

If crossing over did not occur, which of the following statements about meiosis would be true?

There would be less genetic variation among gametes.

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