Chapter 14 - Mendel & The Gene Idea

Which of the following statements is correct in describing the terms monohybrid cross and dihybrid cross?

• A) A dihybrid cross involves organisms that are heterozygous for two characters that are being studied, and a monohybrid cross involves organisms that are heterozygous for only one character being studied.

• B) A monohybrid cross is performed for one generation, whereas a dihybrid cross is performed for two generations.

• C) A monohybrid cross results in a 9:3:3:1 ratio, whereas a dihybrid cross gives a 3:1 ratio.

• D) A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents.

Tags

NGSS.HS-LS3-3

What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?

• A) There is considerable genetic variation in garden peas.

• B) Recessive genes occur more frequently in the F_1 generation than do dominant ones.

• C) Traits are inherited in discrete units and are not the result of "blending."

• D) Genes are composed of DNA.

Tags

NGSS.HS-LS3-3

NGSS.HS-LS3-1

How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?

• A) 4

• B) 64

• C) 16

• D) 8

Tags

NGSS.HS-LS3-2

The individual with genotype AaBbCCDdEE can make many kinds of gametes. Which of the following correctly describes why this situation is possible?

• A) different possible assortment of chromosomes into gametes occurs

• B) recurrent mutations form new alleles

• C) there is a tendency for dominant alleles to segregate together

• D) crossing over during prophase I leads to genetic variety

Tags

NGSS.HS-LS3-2

Mendel continued some of his experiments into the F_2 or F_3 generation in order to ________.

• A) observe whether or not a recessive trait would reappear

• B) distinguish which alleles were segregating

• C) observe whether or not the dominant trait would reappear

• D) obtain a larger number of offspring on which to base statistics

Tags

NGSS.HS-LS3-3

NGSS.HS-LS3-1

Which of the following statements about independent assortment or segregation is correct?

• A) The law of independent assortment is accounted for by observations of prophase I of meiosis.

• B) The law of independent assortment describes the behavior of two or more genes relative to one another.

• C) The law of segregation is accounted for by anaphase of mitosis.

• D) The law of segregation describes the behavior of two or more genes relative to one another.

Tags

NGSS.HS-LS3-2

A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length (T). Its genotype is HhTt. Which of the following genotypes is possible in a gamete from this organism?

• A) HT

• B) HhTt

• C) T

• D) Hh

Tags

NGSS.HS-LS3-2

Which of the following statements correctly describes how Mendel accounted for the observation that traits had disappeared in the F_1 generation and then reappeared in the F_2 generation?

• New mutations were frequently generated in the F_2 progeny, causing traits that had been lost in the F_1 to reappear in the F_2.

• Traits can be dominant or recessive, and the recessive traits were "hidden" by the dominant ones in the F_1.

• The mechanism controlling the appearance of traits was different between the F_1 and the F_2 plants.

• Members of the F_1 generation had only one allele for each trait, but members of the F_2 had two alleles for each trait.

Tags

NGSS.HS-LS3-1

Which of the following statements correctly explains the fact that all seven of the pea plant traits studied by Mendel obeyed the principle of independent assortment?

• All of the genes controlling the traits behaved as if they were on different chromosomes.

• All of the genes controlling the traits were located on the same chromosome.

• None of the traits obeyed the law of segregation.

• The diploid number of chromosomes in the pea plants was seven.

Tags

NGSS.HS-LS3-1

Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division?

• metaphase I of meiosis

• prophase I of meiosis

• anaphase II of meiosis

• anaphase I of meiosis

Tags

NGSS.HS-LS3-2