Chapter 9 Sexual Reproduction and Meiosis

The image shows two chromosomes from one of a goat’s body cells. Which statement is true?

• Both came from the mother goat’s egg.

• The chromosomes are not homologous because

  they have different alleles.

• 1 is identical to 2.

• 1, 2, 3, and 4 are identical.

Adult goats have 60 chromosomes in each somatic (body) cell. Why don’t baby goats have 120 chromosomes per body cell?

• Baby goats do not have body cells, only zygote cells.

• Somatic cells are only used for reproduction.

• Goat sperm and egg cells have only 30 chromosomes each.

• Baby goats undergo meiosis instead of mitosis.

A germ cell in the goat’s ovary is getting ready to divide. As its DNA replicates, each chromosome is doubled so there are two attached sister chromatids. At what point will the sister chromatids separate?

• During mitosis

• During Anaphase I

• They will not separate

• During Anaphase II

Many sets of triplets consist of a “pair and a spare,” that is, two identical babies and one nonidentical baby. Producing this arrangement requires ___ sperm and ___ eggs.

• 2, 2

• 1, 3

• 3, 1

• 2, 3

A tetraploid is a cell that contains

• Four pairs of chromosomes, 2 from each parent

• Four sets of each chromosome in a cell

• Half the chromosomes of a somatic cell

• Twice the number of chromosomes found in a diploid cell.