Home
Class 12
BIOLOGY
An allele is dominant if it is expressed...

An allele is dominant if it is expressed in:

A

both homozygous and heterozygous states

B

second generation

C

heterozygous combination

D

homozygous combination

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Alleles**: - Alleles are different forms of a gene. For example, consider a gene represented as 'A'. Here, 'A' could be a dominant allele, while 'a' could be a recessive allele. 2. **Dominant vs. Recessive Alleles**: - A dominant allele is expressed in the phenotype when at least one copy is present. In contrast, a recessive allele is only expressed when two copies are present (homozygous condition). 3. **Homozygous Condition**: - The homozygous condition means that both alleles are the same. For example, 'AA' is homozygous dominant, and 'aa' is homozygous recessive. The dominant allele 'A' will be expressed in the homozygous condition (AA). 4. **Heterozygous Condition**: - The heterozygous condition means that the two alleles are different. For example, 'Aa' is a heterozygous condition. In this case, the dominant allele 'A' is expressed, while the recessive allele 'a' is not. 5. **Conclusion**: - An allele is considered dominant if it is expressed in both homozygous (AA) and heterozygous (Aa) states. Therefore, the answer to the question is that a dominant allele is expressed in both homozygous and heterozygous conditions.
### Step-by-Step Solution: 1. **Understanding Alleles**: - Alleles are different forms of a gene. For example, consider a gene represented as 'A'. Here, 'A' could be a dominant allele, while 'a' could be a recessive allele. 2. **Dominant vs. Recessive Alleles**: - A dominant allele is expressed in the phenotype when at least one copy is present. In contrast, a recessive allele is only expressed when two copies are present (homozygous condition). ...
Promotional Banner

Similar Questions

Explore conceptually related problems

When both alleles of a pair are fully expressed in heterozygotes, they are called

Alleles are

Alleles are

Alleles are

Allele is the :-

Assertion :- In Neurospora each gene either dominant or recessive express it's effect. Reason :- Neurospora contain many alleles of a gene.

In a population of 100 cats , 36 were white and 64 were black . If the black allele is dominant over white allele , what is the frequency of black allele in this population of cats ?

In halpoids, both recessive and dominant limitations express themselves because

An organism has a gene ' X '. Its dominant allele expresses character c - 1 while it's recessive allele expresses character c - 2 This dominant allele is completely dominant over the recessive allele . It has another gene ' y ' which in its dominant form doesn't allow any expression of gene ' x ' which of these genotypes of that organism Will produce character c - 1 ?

In………. Both dominant and recessive alleles lack their dominant and recessive relationships