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Heredity and Evolution

Description: Heredity BiologyGenetics and EvolutionGenetics and EvolutionSexual Reproduction in Flowering Plants
Number of Questions: 15
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Tags: Heredity Biology Genetics and Evolution Sexual Reproduction in Flowering Plants
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A trait in an organism is influenced by

  1. maternal DNA only

  2. paternal DNA only

  3. both maternal and paternal DNA

  4. neither by paternal nor by maternal DNA

  5. the environment

Show answer
Correct Option: C
Explanation:

A trait in an organism is influenced by both maternal and paternal DNA.

Identify the vestigial organ(s) in humans.

  1. Vermiform appendix

  2. Nictitating membrane

  3. Wisdom teeth

  4. Erector pili

  5. All of the above

Show answer
Correct Option: E
Explanation:

Vestigial organs have lost all or most of their original function through evolution.

Which of the following pairs of organs is analogous to each other?

  1. Leaf spines and leaf tendrils

  2. Forelimbs of a frog and human hand

  3. Flipper of a whale and leg of a horse

  4. Wings of an insect and wings of a bat

  5. None of the above

Show answer
Correct Option: C
Explanation:

Boas and pythons have vestigial pelvis remnants, which are externally visible as two small pelvic spurs on each side of the cloaca.

A couple with blood types A and B may have children with blood types

  1. A and B only

  2. AB

  3. A, B and AB only

  4. A, B and O only

  5. A, B, AB and O

Show answer
Correct Option: E
Explanation:

A couple with blood types A and B may have children with blood types A, B, AB and O.

What will be the genotypic ratio of the cross between Rr and rr?

  1. 1 : 2 : 1

  2. 3 : 1

  3. 1 : 1

  4. 1 : 1 : 1

  5. 2 : 1

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Correct Option: C
Explanation:

The genotypic ratio of RR : rr is 2 : 2, i.e. 1 : 1.

Which of these is homozygous recessive?

  1. R

  2. r

  3. RR

  4. Rr

  5. rr

Show answer
Correct Option: E
Explanation:

Homozygous recessive is rr.

What will be the genotypic ratio of the cross between Tt and Tt?

  1. 1 : 1

  2. 3 : 1

  3. 1 : 2 : 1

  4. 2 : 1

  5. 1 : 1 : 1

Show answer
Correct Option: C
Explanation:

TT : Tt : tt would be 1 : 2 : 1

What does the homologous organs indicate?

  1. Parallel evolution

  2. Natural selection

  3. Convergent evolution

  4. Common descendent

  5. Genetic drift

Show answer
Correct Option: D
Explanation:

Homologous organs have the same ancestral origin, same structure but different function.

If Tt mates with tt, what will be the characteristic of the offspring?

  1. 75% recessive

  2. 50% recessive

  3. 25% recessive

  4. 25% dominant

  5. All dominant

Show answer
Correct Option: B
Explanation:

When Tt mates with tt, the characteristics of offspring will be 50% recessive & 50% dominant.

Which of the following is a not an autosomal abnormality during birth?

  1. Cri du Chat syndrome

  2. Patau syndrome

  3. Klinefelter syndrome

  4. Edwards syndrome

  5. Down syndrome

Show answer
Correct Option: C
Explanation:

Klinefelter Syndrome is sex-linked, because it is a genetic defect that results in the male having an extra X chromosome.

What are alternative forms of a gene called?

  1. Loci

  2. Multiples

  3. Traits

  4. Allele

  5. Chromosomes

Show answer
Correct Option: D
Explanation:

Alternative forms of a gene are called alleles.

What is the genotype of an individual with Turner syndrome?

  1. XXY

  2. XYY

  3. XO

  4. XXX

  5. YO

Show answer
Correct Option: C
Explanation:

Turner syndrome is caused by a missing or incomplete X chromosome.The genotype is XO.

Which of the following chromosomes carry the sex-linked traits?

  1. X

  2. 13

  3. Y

  4. 18

  5. 15

Show answer
Correct Option: A
Explanation:

Sex-linked traits are carried on the X chromosome.

In a certain plant, purple flowers are dominant to red flowers. If the cross of two purple-flowered plants produces some some purple-flowered and some red-flowered plants, what is the genotype of the parent plants?

  1. PP x Pp

  2. Pp x Pp

  3. pp x pp

  4. pp x PP

  5. PP x PP

Show answer
Correct Option: B
Explanation:

For any offspring to be recessive, each parent must have at least one p.

A pair of characters separate during gamete formation. This is the law of __________.

  1. inheritance

  2. segregation

  3. dominance

  4. independent assortment

  5. evolution

Show answer
Correct Option: B
Explanation:

Mendel's law of segregation states that allele pairs separate during gamete formation, and randomly unite at fertilization.

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