Question

directions: select each correct answer. examine the punnett square below, which represents a cross between a male and a female pear tree. what are the possible genetic variations of offspring in this cross? bb bb bb

Explanation:

To determine the genetic variations of the offspring, we analyze the Punnett square. The male gametes are \( B \) and \( b \), and the female gametes are \( B \) and \( B \).

• For the top - left cell (combining \( B \) from male and \( B \) from female), the genotype is \( BB \).
• For the top - right cell (combining \( B \) from male and \( B \) from female), the genotype is \( BB \).
• For the bottom - left cell (combining \( b \) from male and \( B \) from female), the genotype is \( Bb \).
• For the bottom - right cell (combining \( b \) from male and \( B \) from female), the genotype is \( Bb \).

So the possible genotypes of the offspring are \( BB \) and \( Bb \). The genotype \( bb \) is not possible here because there is no \( b \) from the female parent to combine with the \( b \) from the male parent to form \( bb \).

Answer:

A. BB, B. Bb