Punnett Square Biology EOC Review

Front

Which of the following is a phenotype? Aa, red hair, heterozygous, DNA

Back

red hair

Answer explanation

The correct choice is 'red hair' because it is a visible trait or characteristic resulting from the interaction of an organism's genotype with the environment.

Front

Two heterozygous tall pea plants are crossed. What is the expected phenotypic outcome for the offspring?

Back

75% tall, 25% short

Answer explanation

When two heterozygous tall pea plants are crossed, the expected phenotypic outcome for the offspring is 75% tall and 25% short due to the 3:1 phenotypic ratio predicted by Mendel's laws of inheritance.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

If one allele for a trait is dominant and the other allele is recessive, which trait will be visible?

Back

Dominant will be visible because it hides or blocks the recessive allele.

Answer explanation

Dominant will be visible because it hides or blocks the recessive allele.

Front

What is the genotype for a pea plant heterozygous for round seeds (R), and homozygous recessive for green seeds (y)?

Back

Rryy

Answer explanation

The genotype for a pea plant heterozygous for round seeds (R) and homozygous recessive for green seeds (y) is Rryy because it shows the dominant trait for round seeds (R) and the recessive trait for green seeds (yy).

Front

Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?

Back

3

Answer explanation

The probability of the offspring being tall and white is 3, as determined by the dihybrid cross and key provided.

Front

Snowshoe hares can be found living in the Rocky Mountains of New Mexico. During the summer months, when there is no snow on the ground, the snowshoe hare’s coat color is typically brown. During the winter months, when the mountains are covered in snow, the snowshoe hare’s coat is typically white. Which statement describes the genetic basis for the seasonal changes in coat color?

Back

The genes that control coat color are regulated by hormone signals that are altered by changes in environmental factors.

Answer explanation

The genes that control coat color are regulated by hormone signals that are altered by changes in environmental factors.

Tags

B.6(D)

Front

Genetic cross: AaGG x aaGg. Which genotype is NOT possible in the offspring? Options: AaGG, Aagg, aaGg, aaGG.

Back

Aagg

Answer explanation

The genotype 'Aagg' is not possible in the offspring because it requires both parents to contribute a lowercase 'a' allele, which is not present in the parent genotype AaGG.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What is the genetic basis of coat-color variation in Texas Longhorn cattle?

Back

Differences in the nucleotide sequences of genes

Answer explanation

The genetic basis of coat-color variation in Texas Longhorn cattle is differences in the nucleotide sequences of genes, which determine the expression of specific coat color genes.

Tags

B.6(A)

Front

When a new mutation occurs in a somatic cell of a sexually reproducing organism, what percentage of the individual’s offspring are likely to inherit the mutation?

Back

0%

Answer explanation

When a new mutation occurs in a somatic cell, it is not passed on to offspring as it is not present in the germline cells responsible for reproduction. Therefore, the percentage of offspring inheriting the mutation is 0%.

Tags

B.6(E)

Front

Some angelfish colors are determined by codominance. Possible phenotypes and genotypes of angelfish colors are shown. Which table shows the expected phenotypes of offspring resulting from a cross between a black angelfish and a black-lace angelfish?

Back

Tags

B.6(F)