Reproduction, Heredity and Growth Unit Test

Most lions have tawny brown coats, but a few have very pale beige coats. The different coat colors result from genetic differences and so are

• A. acquired traits

• B. inherited traits

• E. allele

• C. alleles

Many factors can affect the growth of crops. Which of these examples describes how a genetic factor can influence the growth of crops?

• A. Farmers notice that many strawberry plants have died after a late frost.

• B. Farmers have found a way to grow oranges that are resistant to disease so that more make it to harvest.

• C. Farmers have found that aerating, or adding more oxygen to the soil, helps their peanut crops grow better.

• D. Farmers find that their potatoes grow larger when the water that they use to irrigate with has a higher acidity.

Many plants can reproduce both sexually and asexually. For example, rose bushes reproduce asexually when cuttings planted in the ground grow roots and become new rose bushes. They can also reproduce sexually when their flowers are pollinated. What is the primary advantage of sexual reproduction in roses?

• A. Roses can reproduce sexually without the use of gametes.

• B. Roses reproduce more quickly when reproducing sexually.

• C. Roses can produce more offspring in sexual reproduction.

• D. Roses produced through sexual reproduction have more genetic variation.

Which statement is an example of asexual reproduction?

• A. Stargazer lilies are pollinated by bees, who bring pollen from one lily to another as they feed on the lily's nectar.

• B. Bluegill fish reproduce when males fertilize eggs laid by female fish.

• C. Some queen ants produce worker ants by laying eggs that are not fertilized.

• D. Jellyfish reproduce when males and females release gametes into the water.

Many plant species can reproduce through vegetative propagation. In this process, a cutting from a plant above the ground is planted. The cutting will grow roots and form a new plant. What type of reproduction does this represent?

• A. sexual

• B. budding

• C. asexual

The human trait of having dimples (D) is dominant over not having dimples (d). A male and female couple both have dimples, but their daughter does not. What must the genotype of the parents be in order to have non-dimpled children?

Answer explanation

Which is the genotype for a heterozygous allele pair?

• BB

• Bb

• bb

Which is the genotype for a homozygous dominant allele pair?

• BB
• Bb

• bb

• bB

Which is the genotype for a homozygous recessive allele pair?

• BB
• Bb

• bb

• bB

Which example of coral reproduction produces offspring that are genetically different from the parent?

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