SAT - Science - Biology - Genetics and Evolution

Question - 1

Alternative forms of a gene are called ______

  • A Loci
  • B Multiples
  • C Chromosomes
  • D Alleles

Question - 2

Heredity or inheritance of specific traits became clearer due to

  • A Lamarck's theory
  • B Mendel worked on garden peas
  • C Darwinism
  • D Neo-Darwinism

Question - 3

Which of these is homozygous recessive?

  • A Ss
  • B ss
  • C SS
  • D s

Question - 4

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

  • A 1:2:1
  • B 3:1
  • C 1:1
  • D 1:1:1

Question - 5

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

  • A 1:1
  • B 3:1
  • C 1:2:1
  • D 1:1:1

Question - 6

The offspring resulting from a cross between two pure homozygous recessives would be ________

  • A 50% homozygous recessive and 50% homozy-gous dominant
  • B 75% homozygous recessive and 25.%hetero-zygous dominant
  • C 75% homozygous recessive and 25% homoz-ygous dominant
  • D 100% homozygous recessive

Question - 7

On what cellular structures are genes in eukaryotes carried?

  • A Endoplasmic reticulum
  • B Nuclear membrane
  • C Chromosomes
  • D Mitochondria

Question - 8

Which of the following sentences is true about the evolutionary process?

  • A There is no real 'progress' in the idea of evolution
  • B Humans are unique, a totally new type of organism.
  • C Progress is nature's religion.
  • D Evolution of life forms was rapid in the beginning ages

Question - 9

Microevolution takes place due to:

  • A Somatogenic variation
  • B Blastogenic variation
  • C Continuous variation
  • D Successive variation

Question - 10

In man the chromosome number is 46. How many chromosomes are present in man's muscle cells?

  • A 23
  • B 46
  • C 69
  • D Variable
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