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AP Biology Unit 5C: Non-Mendelian Genetics & Population Transmission — practice questions — page 3

Explore 100 free Unit 5C: Non-Mendelian Genetics & Population Transmission questions in AP Biology Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 5C: Non-Mendelian Genetics & Population Transmission questions and exercises with answers

Showing questions 61–90 of 100.

Linkage map distance of 1 cM (centimorgan) corresponds to:Read the answer and worked solution →In Mendel's monohybrid cross between a pure tall and a pure dwarf pea plant, what is the phenotypic ratio observed in the F2 generation?Read the answer and worked solution →What is the genotypic ratio obtained when a heterozygous tall pea plant (Tt) is self-pollinated?Read the answer and worked solution →A pea plant has the genotype Tt for stem length. The state of having two unlike alleles for a trait is best described by which term?Read the answer and worked solution →Which term refers to the external, observable expression of a particular trait in an organism?Read the answer and worked solution →In Mendel's dihybrid cross with round-yellow and wrinkled-green seeds, what is the phenotypic ratio of the F2 generation?Read the answer and worked solution →A homozygous round-yellow pea plant (RRYY) is crossed with a homozygous wrinkled-green plant (rryy). What is the phenotype of all the F1 offspring?Read the answer and worked solution →Two factors that form a pair and control the alternative forms of a single contrasting character are together called what?Read the answer and worked solution →A segment of DNA that is responsible for the inheritance of a particular phenotypic character is called what?Read the answer and worked solution →The specific fixed position occupied by a gene on a chromosome is known as its what?Read the answer and worked solution →During cell division, the spindle fibres attach to the chromosome at a specific region. What is this region called?Read the answer and worked solution →A chromosome in which the centromere lies exactly in the centre, forming two equal arms and a V shape, is classified as which type?Read the answer and worked solution →A normal human body cell contains 23 pairs of chromosomes. How many of these pairs are autosomes?Read the answer and worked solution →According to the Watson and Crick model, the nitrogenous base adenine always pairs with which base?Read the answer and worked solution →One strand of a DNA molecule has the base sequence A-G-C-T. What will be the complementary base sequence on the opposite strand?Read the answer and worked solution →Each nucleotide of a DNA molecule is made up of three components. Which set correctly lists all three?Read the answer and worked solution →During DNA replication, the short DNA segments synthesised on the lagging strand are joined together by which enzyme?Read the answer and worked solution →Which enzyme binds at the origin of replication and separates the two strands of the DNA molecule during replication?Read the answer and worked solution →In humans, the sex of a child is determined by the type of sex chromosome carried by which gamete?Read the answer and worked solution →If an egg carrying X fuses with a sperm carrying Y, what will be the sex chromosome make-up and sex of the resulting child?Read the answer and worked solution →Down's syndrome in humans is caused by the presence of an extra copy of which chromosome?Read the answer and worked solution →The gain or loss of one or more chromosomes from a normal set, as seen in Trisomy and Monosomy, is called what?Read the answer and worked solution →Sickle cell anaemia results from a change in the nucleotide sequence of a single gene. This kind of change is best classified as which type of mutation?Read the answer and worked solution →Mendel's law of segregation states thatRead the answer and worked solution →A monohybrid cross between two heterozygotes (Tt × Tt) gives a phenotypic ratio ofRead the answer and worked solution →Independent assortment is demonstrated by a dihybrid cross resulting in a phenotypic ratio ofRead the answer and worked solution →Incomplete dominance is characterised byRead the answer and worked solution →Codominance is best illustrated byRead the answer and worked solution →Sex linked inheritance is exemplified byRead the answer and worked solution →Pleiotropy refers toRead the answer and worked solution →

Worked practice questions

Linkage map distance of 1 cM (centimorgan) corresponds to:

  1. 1% recombination frequency between two markers in offspring
  2. Random
  3. 1 chromosome
  4. 1 mutation
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Correct answer: A. 1% recombination frequency between two markers in offspring

1 cM = 1% recombination frequency. **In human genome:** 1 cM ≈ 1 Mb on average (varies by location and sex). Maximum linkage map distance = 50 cM (genes appear unlinked). Used to construct genetic maps before physical sequencing.

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In Mendel's monohybrid cross between a pure tall and a pure dwarf pea plant, what is the phenotypic ratio observed in the F2 generation?

  1. 1 tall : 1 dwarf
  2. 9 tall : 7 dwarf
  3. 3 tall : 1 dwarf
  4. 2 tall : 1 dwarf
Show answer and solution

Correct answer: C. 3 tall : 1 dwarf

1. Cross parents TT (tall) and tt (dwarf); all F1 are Tt and tall. 2. Self the F1: Tt x Tt. 3. Punnett square gives 1 TT : 2 Tt : 1 tt. 4. TT and Tt both look tall (3), tt is dwarf (1). 5. So the phenotypic ratio is 3 tall : 1 dwarf, which is option C. _Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "Monohybrid Cross", p.269_

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What is the genotypic ratio obtained when a heterozygous tall pea plant (Tt) is self-pollinated?

  1. 3 : 1
  2. 1 : 2 : 1
  3. 1 : 1
  4. 9 : 3 : 3 : 1
Show answer and solution

Correct answer: B. 1 : 2 : 1

1. Self-cross Tt x Tt. 2. Gametes from each parent are T and t. 3. Punnett square gives one TT, two Tt and one tt. 4. Writing genotypes in order gives 1 TT : 2 Tt : 1 tt, that is 1 : 2 : 1, option B. 5. The 3 : 1 in option A is the phenotypic ratio, not the genotypic ratio. _Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "Monohybrid Cross", p.269_

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