Genetics

A ______ is a part of the DNA code on a chromosome.

• gene

• genotype

• phenotype

• gender

The study of ________ is called genetics.

• heredity

• dominance

• pea plants

• mutations

Gregor Mendel studied heredity using ______ plants.

• pea

• rose

• maize

• tundra

A Punnett Square shows you all the ways in which _____ can combine.

• alleles

• eggs

• sperm

• colors

Of the following, which represents a. homozygous recessive genotype?

• tt

• TT

• Tt

• TTT

________ is the study of how traits are passed from parents to offspring.

• Genetics

• Fertilization

• Seed production

• Selective breeding

A heterozygous orange-flowered plant is crossed with a homozygous purple-flowered plant. If orange is a dominant allele and purple is recessive, what color ratio will the flowers of the offspring have?

• 1 purple: 3 orange

• 4 purple: 0 orange

• 2 purple: 2 orange

• 0 purple: 4 orange

In this cross between two pea plants, smooth(S) is dominant. The offspring are:

• 100% smooth

• 50% smooth and 50% wrinkled

• 75% wrinkled and 25% smooth

• 75% smooth and 25% wrinkled

A and B are the same kind of fish. A has a genotype for narrow fins (ww) and B has a genotype for wide fins (W-) Which of the following genotypes of parent fish will produce only offspring having wide fins? Draw a Punnett square to determine answer.

• Ww and Ww

• WW and ww

• Ww and ww

• ww and ww

Bird A has the genotype ll for short bill length. Bird B is LL for long bill length. The bills of their offspring would be___

• long in 100% of the offspring

• short in 100% of the offspring

• long in 50% of the offspring

• short in 75% of the offspring