206k views
3 votes
Recognize progeny ratios that imply the existence of recessive lethal alleles.

User Jissell
by
7.9k points

1 Answer

0 votes

Answer:

Step-by-step explanation:

From Mendel’s Law of Segregation we can expect, as a result of a monohybrid cross, a phenotypic ratio of 3:1 in the offspring.

If you get a different ratio such as 2:1, and notice that a particular genotype does not appear in the offspring, you can suspect that genotype is lethal.

Mendel’s Law of Independent Assortment on the other hand says that the offspring resulting from a dihybrid cross will have a phenotypic ratio of 9:3:3:1.

If you get numbers that don't match the expected ratios, and are smaller numbers like 4:2:2:1, and notice that a particular combination of alleles does not appear, you can suspect that allele is recessive and lethal in an homozygous individual.

User William Niu
by
7.2k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.