Question

if two parents are each heterozygous, the probability of their child being homozygous recessive is: (*complete a punnet square).

0%
25%
50%
75%

paired alleles always separate and go to different gametes during: *

meiosis
punnett squares
mitosis
binary fission

choose the best claim for the unit *

individuals have specific alleles which make up their genotype
genotypes and phenotypes are based on your environment
environmental factors contribute to alleles

Explanation:

Determine the offspring genotypes from heterozygous parents

Using the Punnett Square knowledge point
Let the dominant allele be \(A\) and the recessive allele be \(a\). Both parents are heterozygous (\(Aa \times Aa\)).

$$
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The homozygous recessive genotype is \(aa\), which represents 1 out of 4 possible outcomes.

$$ P(aa) = \frac{1}{4} = 25\% $$

Identify when paired alleles separate into gametes

Using the Meiosis knowledge point
During gamete formation, homologous chromosomes (and thus paired alleles) segregate from each other. This biological process of division that reduces the chromosome number by half to produce haploid gametes is meiosis.

Evaluate the best claim for the unit

Using the Genotype and Phenotype knowledge point
An individual's genetic makeup is defined by the specific alleles they possess, which constitute their genotype. Phenotypes are influenced by genotypes (and sometimes the environment), but genotypes themselves are defined by these specific inherited alleles.

Answer:

Question 1

• (A) 0%
• (B) 25% (Correct answer)
• (C) 50%
• (D) 75%

Question 2

• (A) Meiosis (Correct answer)
• (B) Punnett Squares
• (C) Mitosis
• (D) Binary Fission

Question 3

• (A) Individuals have specific alleles which make up their genotype (Correct answer)
• (B) Genotypes and phenotypes are based on your environment
• (C) Environmental factors contribute to alleles