Alleles

Q.

What are the three types of genetic variations?

Q.

How are new alleles formed?

Q.

Which is dominant -Round or Wrinkled seed shape?

Q.

How can you tell if someone is heterozygous or homozygous?

Q. Where are genes located? What is the chemical nature of genes

Q.

Why is a dominant allele called dominant?

Q.

Why do alleles occur in pairs?

Q. A/An is an alternative form of a gene. Organisms typically have alleles for a single trait.

1. one
2. allele
3. two
4. chromosome
5. DNA
6. three

Q. Allele pairs separate or segregate during gamete formation, and randomly unite during fertilization.

1. True
2. False

Q.

Which allele is recessive?

Q. Regarding the assertion and reason, select the correct option.

Assertion [A]: A pair of different and contrasting form of genes are known as alleles.
Reason [R]: Generally, a gene has two alleles.

1. Both A and R are true, but R does not explain A
2. Both A and R are true and R explains A
3. A is true and R is false
4. Both A and R are false

Q.

What is the key to the recognition of codominance?

Q. What is the difference between allele and genes? How many alleles are present in human body?

Q.

Alternative forms of a gene

Enter 1 word only.

Q.

Different versions of a gene are known as ___.

1. alleles

2. traits

3. characters

4. chromatids

Q. Alleles are alternate forms of different genes.

1. False
2. True

Q. Generally, a gene has alleles.

1. six
2. one
3. two
4. three

Q.

among lion , tiger and domestic cat , all the three have the same number of 38 chromosomes , yet they have different appearances.How do you account for such differences?

Q. If we cross two heterozygous individuals, the percentage of offspring with recessive phenotype will be

1. $2$
2. $4$
3. $16$
4. $50$
5. $25$

Q. The example of recapitulation theory is

1. Tadpole of frog
2. Placenta of mammals
3. Embryonic membranes of reptiles
4. Canine teeth of dog

Q.

Blue eye color and black eye color are controlled by ____of the same gene.

1. types

2. copies

3. alleles

4. parts

Q. What are alleles?

1. Alternative forms of a gene
2. Alternative forms of a character
3. Homozygous genotype
4. Several possible forms of a gene

Q. Assertion :Dominance is not an autonomous feature of a gene. Reason: It depends as much on the gene product and the production of a particular phenotype from this product.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. A trihybrid cross is made between two plants with genotypes A/a B/b C/c, how many offsprings of such cross will have a genotype a/a b/b c/c?

1. 1/4
2. 1/64
3. 1/16
4. 1/32

Q. Alleles are ___.

1. total set of genes present on a chromosome
2. total chromosomes present in a genome
3. two alternative forms of a character
4. two alternative forms of a gene

Q. In dihybrid cross, out of 16 plants obtained, the maximum number of different genotypes possible are

1. 4
2. 9
3. 16
4. 12

Q.

The cross between an individual with unknown genotype and recessive parent is called a ___.

1. Inter cross

2. Test cross

3. Top cross

4. Batch cross

Q.

When a gene exists in more than one form, the different forms are termed as _______.

1. dominant
2. recessive
3. traits

4. alleles