In a monohybrid cross between a homozygous tall plant (TT) and a homozygous short plant (tt), what fraction of offspring are tall?

Prepare for the Leaving Cert Biology exam with our Genetics test! Use targeted study aids, hints, and explanations for each question to boost your confidence and success. Get exam-ready now!

Multiple Choice

In a monohybrid cross between a homozygous tall plant (TT) and a homozygous short plant (tt), what fraction of offspring are tall?

Explanation:
When you cross a homozygous tall plant (TT) with a homozygous short plant (tt), each offspring gets a T allele from the tall parent and a t allele from the short parent. So every offspring has the genotype Tt. Since the tall allele T is dominant, all offspring will express the tall phenotype. That means 100% of the offspring are tall.

When you cross a homozygous tall plant (TT) with a homozygous short plant (tt), each offspring gets a T allele from the tall parent and a t allele from the short parent. So every offspring has the genotype Tt. Since the tall allele T is dominant, all offspring will express the tall phenotype. That means 100% of the offspring are tall.

Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy