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AP Biology Unit 5C: Non-Mendelian Genetics & Population Transmission — practice questions — page 4

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 91–100 of 100.

In Drosophila, the linkage groups equal theRead the answer and worked solution →Crossing over occurs during which stage of meiosis?Read the answer and worked solution →Down syndrome in humans is caused byRead the answer and worked solution →In birds, the sex-determination mechanism is:Read the answer and worked solution →In the Watson-Crick double helix, adenine pairs with thymine via how many hydrogen bonds?Read the answer and worked solution →Mendel conducted his hybridisation experiments on which plant?Read the answer and worked solution →In Mendel's monohybrid cross between true-breeding tall (TT) and dwarf (tt) plants, the F₂ phenotypic ratio was:Read the answer and worked solution →The F₂ **genotypic** ratio in Mendel's monohybrid cross is:Read the answer and worked solution →The semiconservative nature of DNA replication was experimentally proved by:Read the answer and worked solution →Which of the following is **not** a stop codon?Read the answer and worked solution →

Worked practice questions

In Drosophila, the linkage groups equal the

  1. diploid number of chromosomes
  2. haploid number of chromosomes
  3. number of sex chromosomes
  4. number of genes
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Correct answer: B. haploid number of chromosomes

1. A linkage group is a set of genes that travel together because they lie on the same chromosome. 2. Each chromosome of the haploid set forms one linkage group. 3. Drosophila has 4 pairs of chromosomes, hence 4 linkage groups. _Source: Maharashtra Balbharati Std XII Biology, Ch 3 "Inheritance and Variation" §3.8_

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Crossing over occurs during which stage of meiosis?

  1. Metaphase II (typical)
  2. Anaphase II
  3. Pachytene of prophase I
  4. Telophase I
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Correct answer: C. Pachytene of prophase I

1. Crossing over involves reciprocal exchange of chromatid segments between non-sister homologous chromatids. 2. It happens after pairing (zygotene) at the pachytene sub-stage of prophase I. 3. It is the cytological basis of recombination. _Source: Maharashtra Balbharati Std XII Biology, Ch 3 "Inheritance and Variation" §3.8_

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Down syndrome in humans is caused by

  1. monosomy of chromosome 21
  2. deletion in chromosome 5
  3. mutation in HBB gene
  4. trisomy of chromosome 21
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Correct answer: D. trisomy of chromosome 21

1. Down syndrome arises when an individual receives an extra copy of chromosome 21. 2. Karyotype shows 47 chromosomes with three copies of 21 (trisomy 21). 3. It results from non-disjunction during meiosis, typically in the maternal egg. _Source: Maharashtra Balbharati Std XII Biology, Ch 3 "Inheritance and Variation" §3.10_

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