AP BIOLOGY

HEREDITY

LAW OF SEGREGATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Recessive alleles are represented by:
A
a ratio
B
a percentage
C
capital letters
D
lower-case letters
Explanation: 

Detailed explanation-1: -Recessive alleles are denoted by a lowercase letter (a versus A). Only individuals with an aa genotype will express a recessive trait; therefore, offspring must receive one recessive allele from each parent to exhibit a recessive trait.

Detailed explanation-2: -Dominant alleles are represented by capital letters and recessive alleles are represented by lowercase letters. For example, blue eyes are a recessive trait and brown eyes are a dominant trait.

Detailed explanation-3: -Recessive alleles are always represented by lowercase letters. In order for an organism to express a recessive allele, it must have received a recessive allele from both of its parents. In the above Punnett square diagram, two heterozygous dominant parents are mating.

Detailed explanation-4: -An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype. In our example, this genotype is written Bb. Finally, the genotype of an organism with two recessive alleles is called homozygous recessive. In the eye color example, this genotype is written bb.

Detailed explanation-5: -Definition. A type of allele that when present on its own will not affect the individual.

There is 1 question to complete.