Biology Chapter 6 Review--Meiosis and Mendel

The father of genetics was

• T.A. Knight.

• Hans Krebs.

• Gregor Mendel.

• None of the answers are correct

homozygous : heterozygous ::

• heterozygous : Bb

• probability : predicting chances

• BB : Bb

• homozygous : BB

The law of segregation explains that

• alleles of a gene separate from each other during meiosis.

• different alleles of a gene can never be found in the same organism.

• each gene of an organism ends up in a different gamete.

• each gene is found on a different molecule of DNA.

The phenotype of an organism

• represents its genetic composition.

• reflects all the traits that are actually expressed.

• occurs only in dominant pure organisms.

• cannot be seen.

If an individual has two recessive alleles for the same trait, the individual is said to be

• homozygous for the trait.

• haploid for the trait.

• heterozygus for the trait.

• mutated.

A trait that occurs in 450 individuals out of a total of 1,800 individuals occurs with a probability of

• 0.04.

• 0.25.

• 0.50.

• 0.75.

What is the expected genotypic ratio resulting from a heterozygous x heterozygous monohybrid cross?

• 1 : 2 : 1

• 1 : 3 : 1

• 1 : 2

• 1 : 0

An organism that has inherited two of the same alleles of a gene from its parents is called

• hereditary.

• heterozygous.

• homozygous.

• a mutation.

In pea plant, yellow seeds are dominant over green seeds. What would be the expected genotype ratio in a cross between a plant with green seeds and a plant that is heterozygous for seed color?

• 1 : 3

• 1 : 2 : 1

• 4 : 1

• 1 : 1

The difference between a monohybrid cross and a dihybrid cross is that

• monohybrid crosses involve traits for which only one allele exists, while dihybrid traits involve two alleles.

• monohybrid crosses involve self-pollination, while dihybrid crosses involve cross-pollination.

• monohybrid crosses involve one trait; dihybrid crosses involve two traits.

• dihybrid crosses require two Punnett squares; monohybrid crosses need only one.