Module 1 Grade6

Which of the following types of organisms does not produce offspring with genetic variation?

• humans

• dogs

• trees

• hydra

Which of the following organisms does NOT primarily reproduce asexually?

• bacteria

• archaea

• protists

• mammals

Two sex cells join to produce a new individual in .........................reproduction.

Genetic ......................exists among all organisms that sexually reproduce.

.......................reproduction requires two parent organisms.

Parents pass their traits down to their offspring through their __________.

• daughter cells

• son cells

• body cells

• reproductive cells

Only male animals use pheromones to attract mates.

• True

• False

A botanist has a plant that produces beautiful red flowers, but sometimes it has white flowers. If she crosses both plants as shown here, 50% of the offspring will have red flowers.

• True

• False

A and B are the same kind of fish. A has a genotype for narrow fins (ww), and B has a genotype for wide fins (W-). Which of the following genotypes of parent fish will produce only offspring having wide fins?

• Ww and Ww

• WW and ww

• Ww and ww

• ww and ww

Kari has two pet rats with black fur. When her rats mated, one of their four offspring had white fur, and the other three had black fur. Which is most likely true for Kari’s rats?

• Both parents are homozygous for the white-fur trait, which is recessive.

• Both parents are heterozygous for the white-fur trait, which is dominant.

• Both parents are heterozygous for the white-fur trait, which is recessive.

• Both parents are heterozygous for the white-fur trait, which is sex-linked.