Genetics Test

A tool used to determine all of the possible alleles is called a...

• punnett square.

• heredity chart.

• allele graph.

• gene sequence.

Females have the sex chromosomes ___ and males have the sex chromosomes ___.

• XX ; XY

• XY ; XX

• Both choices are correct.

• Neither choice is correct.

Which are sex chromosomes?

• X and Y

• A and B

• X and C

• All choices are correct

rr is an example of what type of genotype?

• homozygous recessive

• heterozygous

• homozygous dominant

• heterozygous recessive

Dominant alleles are represented with a ___________ letter.

• capital

• lowercase

• undercase

• small

Hybrids are...

• homozygous.

• organisms that receive different alleles from each parent.

• recessive.

• dominant.

Who studied inheritance of traits by using pea plants?

• Mendel

• Einstein

• Mendeleev

• Koon

Two true-breeding plants (tall and short) are cross-pollinated. If a member of the F1 generation are allowed to self-pollinate, which traits will show up in the F2 generation?

• tall and short

• only tall

• only short

• none of those traits will show up

In the P generation, a tall plant was crossed with a short plant. Short plants reappeared in the F₂ generation because

• the allele for shortness and the allele for tallness segregated when the F1 plants produced gametes.

• some of the F2 plants produced gametes that carried the allele for shortness.

• the allele for shortness is dominant.

• they inherited an allele for shortness from one parent and an allele for tallness from the other parent.

The principles of probability can be used to

• predict the traits of the offspring produced by genetic crosses.

• determine the actual outcomes of genetic crosses.

• predict the traits of the parents used in genetic crosses.

• decide which organisms are best to use in genetic crosses.