Question 1

The benefit of sexual reproduction is the production of genetic ________ in offspring.

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Question 2

In analyzing data for crosses involving two genes,Mendel discovered not only that these alleles separate from each other when examining one trait but also that the alleles of a second trait will separate from each other without regard to those of the first trait.This observation was the basis of Mendel's law of ________.

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Question 3

In analyzing data for crosses involving one gene,Mendel discovered that alleles are discrete entities,and that they are separated during formation of gametes.This was the basis of Mendel's law of ________.

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Question 4

________ is the mechanism by which some organisms,such as Komodo dragons,can develop eggs into zygotes without sperm.

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Question 5

A structure consisting of two homologous chromosomes bound together so tightly during the first meiotic prophase that they behave as a single unit is called a ________.

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Question 6

The condition of a zygote with three copies of a chromosome is known as ________.

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Question 7

Diploid human cells contain 22 homologous chromosomes and a pair of ________.

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Question 8

________ is the term used to describe the condition of a cell containing a chromosome number that is not a multiple of the haploid number.

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Question 9

A mishap in chromosomal partitioning during meiosis is referred to as ________.

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Question 10

Metaphase II arrest is mediated by ________,a biochemical activity present in mature eggs.

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Question 11

The designation of YyWw for a heterozygous pea plant is the plant's ________.

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Question 12

A genetic cross was performed with two pea plants both with green,wrinkled seeds.Of the resulting offspring,75% had green,wrinkled seeds and 25% had green,smooth seeds (W = wrinkled; w = smooth).With regard to wrinkled versus smooth seeds,the parental plants must have been ________.

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Question 13

The pairing of homologous chromosomes during meiosis I is known as ________.

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Question 14

In an individual pea plant,the visible characteristics of yellow and wrinkled seeds are the plant's ________.

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Question 15

The observation by Masui that cytoplasm from a mature egg injected into an immature oocyte stimulated meiosis led to the identification of ________.

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Question 16

Meiosis I is known as a ________ division because of what happens to the chromosome number.

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Question 17

________ chromosomes pair during ________ of meiosis.

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Question 18

DNA ________ accounts for the ability of chromosomes to undergo synapsis.

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Question 19

Most cases of Down syndrome are caused by three copies of chromosome number ________.

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Question 20

In meiosis in females,only one haploid cell develops into an egg.The remaining haploid products of meiosis are ________,which usually degenerate.

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Quiz 25: Sexual Reproduction,meiosis,and Genetic Recombination