Genetics and Meiosis Worksheet

Crossing over during meiosis

• contributes to the genetic diversity of a species.

• occurs during meiosis I and meiosis II.

• is required for the pairing of homologous chromosomes.

• ensures that the resulting haploid cells will have the same combination of homologous chromosomes as the original diploid cell.

• aids the alignment of sister chromatids in a single row along the metaphase plate.

The pedigree below is of a genetic disorder called Raphaelle Syndrome, which is normally quite rare. The family shown here lives in a remote Alpine village in which people have married locally for quite some time, so that some degree of inbreeding has contributed to a relatively high frequency of Raphaelle syndrome in this population. Based on this pedigree Raphaelle Syndrome is inherited as a(n) _________ trait?

• autosomal recessive

• random

• autosomal dominant

• sex-linked recessive

• sex-linked dominant

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

In this pedigree of Raphaelle Syndrome, what is the most appropriate genotype of the unaffected grandfather?

• XRXR

• Rr

• rr

• XRX+

• RR

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

Which phase of mitosis is shown in the picture below?

• Telophase

• Metaphase

• Prometaphase

• Anaphase

• Prophase

Tags

NGSS.HS-LS1-4

Sexual reproduction involves the alternation of

• meiosis and fertilization

• mitosis and gamete formation

• gamete formation and meiosis

• mitosis and fertilization

• mitosis and meiosis

• The amount of thymine cannot be determined.

• one heavy and one half-heavy band

• one light band

• one heavy and one light band

• one half-heavy (intermediate to heavy and light) band

• one heavy band

A cross between two pea plants results in 732 purple and 268 white plants. What is (are) the genotype(s) and phenotype(s) of the parents that produced these offspring?

• one parent is homozygous purple, second parent is homozygous white

• one parent heterozygous purple, second parent homozygous white

• one parent is homozygous purple, second parent is heterozygous white

• one parent is heterozygous purple, second parent is heterozygous white

• both parents are heterozygous purple

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

The figure represents the nucleus of a diploid, somatic animal cell about to enter mitosis. How many chromosomes, homologous pairs and chromatids does this cell have?

• 16 chromosomes, 4 homologous pairs, 16 chromatids

• 16 chromosomes, 8 homologous pairs, 8 chromatids

• 8 chromosomes, 4 homologous pairs, 8 chromatids

• 8 chromosomes, 4 homologous pairs, 16 chromatids

• 8 chromosomes, 8 homologous pairs, 16 chromatids

Tags

NGSS.HS-LS1-4

When is DNA duplicated for mitosis?

• during G2 of interphase

• during G1 of interphase

• during prophase of mitosis