Question

in a monohybrid cross between two heterozygous parents (rr x rr), what is the probability of the offspring showing the recessive phenotype? a. 0% b. 25% c. 50% d. 75% which term refers to the occurrence of two different alleles for a specific gene in an individuals genotype (aa)? a. homozygous b. homozygous dominant c. homozygous recessive d. heterozygous what is the primary purpose of a punnett square in genetics? a. to visualize the entire genetic makeup of an organism b. to analyze the dna sequence of an organism c. to determine the exact traits of an organism d. to predict the probability of traits being inherited

Explanation:

Step1: Set up Punnett square for Rr x Rr

	R	r
r	Rr	rr

There are 4 possible genotypes.

Step2: Identify recessive phenotype

The recessive phenotype is shown by the genotype rr. Out of 4 possible genotypes, 1 is rr. So the probability is $\frac{1}{4} = 25\%$.

Step3: Define genetic terms

Homozygous means having two identical alleles (AA or aa). Homozygous dominant is AA, homozygous recessive is aa. Heterozygous means having two different alleles (Aa).

Step4: Recall purpose of Punnett square

A Punnett square is used to predict the probability of different genotypes and phenotypes resulting from a genetic cross, which means predicting the probability of traits being inherited.

Answer:

1. b. 25%
2. d. Heterozygous
3. d. To predict the probability of traits being inherited