genetics and punnett squares

If two heterozygous white rabbits are crossed, what is the expected phenotype ratio of their offspring?

• 50% white; 50% brown.

• 75% white; 25% brown.

• 100% white; 0% brown.

• 25% white; 75% brown.

Tags

NGSS.HS-LS3-1

In genetics, what does the term 'allele' refer to?

• Different forms of a gene.

• A type of mutation in DNA.

• A specific location on a chromosome.

• A protein that influences traits.

If a dominant trait is represented by 'A' and a recessive trait by 'a', what is the phenotype of an organism with genotype 'Aa'?

• Recessive phenotype

• Dominant phenotype

• Homozygous phenotype

• Phenotype cannot be determined

Tags

NGSS.HS-LS3-1

What is required for a recessive trait to appear in an organism?

• One dominant allele

• Two recessive alleles

• One recessive allele

• Two dominant alleles

What is the term for an organism with two identical alleles for a trait?

• Heterozygous

• Homozygous

• Polygenic

• Monogenic

What is the significance of a test cross in genetics?

• To determine the genotype of an organism with a dominant phenotype.

• To identify the phenotype of a recessive organism.

• To assess the environmental impact on genetic traits.

• To evaluate the mutation rate in a population.

What is the term for an organism with two different alleles for a trait?

• Homozygous

• Heterozygous

• Hemizygous

• Polygenic

In a Punnett square, if T = tall and t = short, what is the genotype of a homozygous recessive organism?

• TT

• Tt

• tt

• TtTt

What does it mean if an organism is homozygous dominant?

• It has two recessive alleles for a trait.

• It has one dominant and one recessive allele for a trait.

• It has two dominant alleles for a trait.

• It has no alleles for that trait.

Tags

NGSS.HS-LS3-1

What is the expected phenotype ratio from a cross between a homozygous dominant and a homozygous recessive organism?

• 50% dominant phenotype

• 75% dominant phenotype

• 100% dominant phenotype

• 25% dominant phenotype

Tags

NGSS.HS-LS3-1