Meiosis and Genetics Test Review

What is the top left arrow pointing to?

• Homozygous dominant

• Heterozygous

• Homozygous recessive

• heterozygous dominant

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

According to the Punnett square in basic mendelian genetics: B reprepsents the dominant gene for blue feathers and b represents the recessive gene for red feathers. Two heterozygous birds have one offspring. What percent chance does it have for red feathers?

• 0%

• 25%

• 75%

• 100%

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

In humans, a male has

• one X chromosome only.

• two X chromosomes.

• one X chromosome and one Y chromosome.

• two Y chromosomes.

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NGSS.HS-LS3-1

Which of the following combinations of sex chromosomes represents a female?

• XY

• XXY

• XXXY

• XX

Situations in which one allele for a gene is not completely dominant over another allele for that gene are called

• multiple alleles.

• incomplete dominance.

• polygenic inheritance.

• multiple genes.

Gregor Mendel’s principles of genetics apply to

• plants only.

• animals only.

• pea plants only.

• all organisms.

A male and female bison that are both heterozygous for normal skin pigmentation (Aa) produce an albino offspring (aa). Which of Mendel’s principles explain(s) why the offspring is albino?

• dominance only

• independent assortment only

• dominance and segregation

• segregation only

Snapdragons, a flowering plant popular with gardeners, can have red, white, and pink colored petals. When snapdragons with red petals (RR) are crossed with snapdragons having white (WW) petals, the offspring have pink petals. The pink coloration (RW) is a phenotype in between the red and white parental phenotypes. What is this kind of inheritance pattern called?

• mendel dominance

• incomplete dominance

• codominance

• recessive inheritance

Two heterozygous purple-flowering pea plants are crossed. If purple is dominant over white, what are the expected phenotypic results?

• 100% purple.

• 75% purple, 25% white.

• 50% purple, 50% white.

• 25% purple, 75% white.

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

The Brahman cattle have good resistance to high temperature, but its meat is poor and tough to eat. The English shorthorn cattle, on the other hand, have good meat, but poor resistance to high temperatures. Scientists formed the Santa Gertrudis cattle by breeding Brahmans with English shorthorns. This new type of cattle has good meat and resistance to high temperatures. This is an example of

• inbreeding

• selective breeding

• natural selection

• genetic engineering