Sbq1 Bio grade 9 v1

A Drosophila fruit fly cell with 2N = 8 chromosomes—two of each kind is called

• a haploid cell

• a diploid cell

One (allele / gene) of each (gene / allele) is located on each (heterozygous / heterologous / homozygous / homologous) chromosome.

• allele / gene / homozygous

• allele/ gene / homologous

• gene / allele / homozygous

• allele / gene/ heterozygous

Which event occurs in meiosis, but not mitosis?

• Separated chromatids move to opposite ends of the cell.

• All chromosomes align along the center of the cell.

• Homologous chromosomes pair to form a tetrad

• The parent cell divides to form genetically-identical daughter cells.

Drosophila fruit flies produce gametes with one of each kind of chromosome. These gametes are called (haploid / diploid) cells. These cells contain (0.5N / 1N / 2N / 4N) chromosomes.

• Diploid / 1N

• Haploid / 0.5N

• Haploid / 1N

• Diploid / 2N

A cell undergoes meiosis. How do the gametes it produces compare with the original cell and with one another?

• The gametes are genetically identical with the parent cell and with one another.

• The gametes have half the chromosomes of the parent cell, and are genetically identical with one another.

• The gametes have half the chromosomes of the parent cell, and are genetically different from one another.

• The gametes have one fourth of the chromosomes of the parent cell, and are genetically identical with one another.

Tags

NGSS.HS-LS3-2

These homologous chromosomes carry different alleles of the A and B genes.How would crossing over affect the distribution of the four alleles: A, B, a, and b?

• Crossing over would always keep A and B together on the same chromosome, and always keep a and b together on the same chromosome

• Crossing over would always put A and B on different chromosomes, and always put a and b on different chromosomes.

• Crossing over would sometimes, but not always, exchange the positions of A and a, and of B and b, on homologous chromosomes.

• Crossing over would sometimes, but not always, delete one or more of the four alleles from both homologous chromosomes.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The table shows the crossing-over frequencies for three genes in the fruit fly Drosophila. The greater the frequency, the more likely that crossing over separates the genes. The gene for eye color (A), wing shape (B), and body color (C) are found on the same chromosome.

What are the two most likely sequences of these genes on a gene map for this chromosome? Select two options

• B, A, C

• A, B, C

• C, B, A

• C, A, B

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following are true regarding the process of meiosis I?

• Chromosome number is reduced from diploid to haploid.

• Sister chromatids in a cell undergoing meiosis are always identical.

• Sister chromatids separate to opposite ends of the cell.

• Most homologue pairs do not have any crossovers during prophase I.

Tags

NGSS.HS-LS3-2

Which stage of meiosis II is the cell in?

• Telophase II

• Prophase II

• Anaphase II

• Metaphase II

Tags

NGSS.HS-LS3-2

Which of the following distinguishes prophase 1 of meiosis from prophase of mitosis?

• Homologous chromosomes pair up

• Spindle forms

• Nuclear membrane breaks down

• Chromosomes condense