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Course: Cambridge AS & A Level Biology 9700 ...
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Cambridge AS & A Level Biology 9700 — Revision Notes

1 · Cell Structure

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2 · Biological Molecules

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3 · Enzymes

0/29

4 · Cell Membranes and Transport

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5 · The Mitotic Cell Cycle

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6 · Nucleic Acids and Protein Synthesis

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7 · Transport in Plants

0/28

8 · Transport in Mammals

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9 · Gas Exchange

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10-11 · Infectious Disease and Immunity

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12 · Energy and Respiration

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13 · Photosynthesis

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14-15 · Homeostasis and Control

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16 · Inherited Change

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17-18 · Selection, Evolution, Classification and Conservation

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19 · Genetic Technology

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Other lessons

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Quiz

16.2.3 Predicting Inheritance- Dihybrid Crosses – Exam questions

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  • Questions count: 9
  • Passing grade: B+
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1.
In pea plants, tall (T) is dominant over short (t), and yellow seeds (Y) are dominant over green (y). In the cross TtYy x TtYy, what fraction of the offspring are tall with green seeds?
1/4
1/16
3/16
9/16
2.
Two genes are located very close together on the same chromosome. Which statement is most likely correct?
They are inherited together and do not follow the law of independent assortment
They assort independently like genes on different chromosomes
They can never be inherited in the same gamete
Crossing over between them is frequent, so they always separate
3.
A dihybrid test cross gives mostly parental phenotypes and few recombinants. The best explanation is:
Epistasis
Codominance
The genes are autosomally linked
Independent assortment
4.
A 9:3:4 ratio in a dihybrid F2 suggests:
Autosomal linkage
Recessive epistasis
Sex linkage
Codominance
5.
Genes on the same chromosome are said to be _____.
polyploid
homozygous
recessive
linked
6.
What phenotypic ratio results from crossing two heterozygotes for two unlinked genes with complete dominance?
3:1
1:1:1:1
9:3:3:1
1:2:1
7.
Which statement best describes Epistasis?
Two genes on the same autosome that tend to be inherited together because they are not separated at independent assortment.
An interaction in which the allele of one gene masks or modifies the expression of a different gene.
The location of a gene on a sex chromosome (usually the X), so that inheritance patterns differ between males and females.
A length of DNA at a particular locus on a chromosome that codes for a polypeptide or functional RNA.
8.
What does the test-cross table show about genes A and B?
They are unlinked
They are on different chromosomes
They are linked, about 13 map units apart
They are 87 map units apart
9.
Which hypothesis suits a fruit-fly linkage experiment?
Body colour and wing shape genes will show fewer than 50% recombinant offspring
Flies are small
Wings are useful
Flies breed
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Part of 16 · Inherited Change — see every lesson and quiz in this unit.
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