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21. When an area of a chromatid is exchanged with the matching area on a chromatid of its homologous chromosome, _____ occurs.
(1 point)
crossing over
mutagenesis
hybridization
fertilization
22. The _____ produced by each parent are shown along the sides of a Punnett square.
(1 point)
zygotes
offspring
gametes
hybrids
23. Mendel's law of segregation states that during meiosis, the factors that control each trait separate, and only _____ from each pair is/are passed to the offspring.
(1 point)
one factor
the dominant trait
two factors
the recessive trait
24. In chickens, rose comb (R) is dominant to single comb (r). A homozygous rose-combed rooster is mated with a single-combed hen. All of the chicks in the F1 generation were kept together as a group for several years. They were allowed to mate only within their own group. What is the expected phenotype of the F2 chicks?
(1 point)
100% rose comb
75% rose comb and 25% single comb
100% single comb
50% rose comb and 50% single comb
25. A DNA nucleotide may be made up of a phosphate group, along with _____.
(1 point)
deoxyribose sugar and uracil
ribose sugar and adenine
deoxyribose sugar and thymine
ribose sugar and cytosine
Figure 11-4
26. What type of mutation has occurred in Figure 11-4?
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