Informal Assessment

The first recorded scientific study of genetics was done by

• Dmitri Mendeleev.

• Carl Linnaeus.

• Gregor Mendel.

• Charles Darwin.

) Punnett squares show the possible…………….. of offspring.

• genotypes

• number of chromosomes

• DNA sequence

• letters of a sequence

The phenotype displays ………………. characteristics.

• recessive

• dominant

• physical

• chemical

When a dominant allele is present, the offspring will show ………………. characteristics.

• recessive

• dominant

• homozygous

• heterozygous

In order for a female child to be born there must be

• an X and Y chromosome.

• two X chromosomes.

• two Y chromosomes

A homozygous recessive phenotype is shown by the genotype

• TT.

• Tt.

• tt.

• tT.

In incomplete dominance, one trait will be expressed.

• True

• False

If the two alleles for one trait are the same (pp or PP), the person is.............. for that trait.

• heterozygous

• homozygous

• oozygous

• nonfertile

) A brown-eyed heterozygous (Ee) parent is crossed with a brown-eyed homozygous dominant (EE) parent. Brown eyes are dominant, and blue eyes are recessive. What are the expected offspring percentages for eye color?

• 100% brown eyes

• 50% brown eyes, 50% blue eyes

• 100% blue eyes

• 75% blue eyes, 25% brown eyes

The Punnett square represents a cross between two parent pea plants. The gene for round shape (R) is dominant over the gene for wrinkled shape (r).

What percentage of the offspring will have a round shape?



• 25 %

• 50 %

• 75 %

• 100 %