A plant can have broad leaves (B) or narrow leaves (b). A plant with genotype BB is crossed with genotype Bb. Which punnet square correctly represents this cross?
Answers
The Punnett square shows the gamete combinations and the probabilities of producing different genotypes and phenotypes. The correct option is A.
What are the Punnett squares?
The Punnett square is a graphic representation that shows the different types of gamete combinations according to the alleles involved in a cross.
Punnett square shows the probabilities of getting offspring with different genotypes and their consequent phenotypes.
Available data:
- B allele is dominant and codes for broad leaves
- b allele is recessive and codes for narrow leaves
- Cross between BB plant and Bb plant
Cross:
Parentals) BB x Bb
Gametes) B B B b
Punnett square) B B
B BB BB
b Bb Bb
F1) Gentoype:
2/4 = 1/2 = 50% of the progeny is exprected to express the h0m0zyg0us dominant genotype, BB.
2/4 = 1/2 = 50% of the progeny is expected to express the heter0zyg0us genotype, Bb.
Phenotype
2/4 = 1/2 = 50% of the plants are exprected to have broad leaves.
2/4 = 1/2 = 50% of the plants are exprected to have narrow leaves.
The correct option is Option A, which shows the correct gametes involved in the cross and the correct gamete combinations.
You will learn more about Punnett squares at
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