Help me brought less anwser in?

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%26#039;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?


(1 point)


point mutation





frame shift





lethal





protein








Figure 12-1


27. What type of inheritance pattern does the trait represented by the shaded symbols in Figure 12-1 illustrate?


(1 point)


incomplete dominance





multiple alleles





codominance





sex-linked





28. In humans, red-green color blindness is _____.


(1 point)


caused by a recessive allele





equally common in both sexes





inherited in males from their fathers





produced in males by a heterozygous genotype





29. A technique that may be employed in the Human Genome Project is _____.


(1 point)


PCR





automated gene sequencers





gel electrophoresis





all of these








Figure 14-4





30. According to Figure 14-4, in how many eras have mammals existed?


(1 point)


2


4


5


7


31. A pattern of evolution that results when two unrelated species begin to appear similar because of environmental conditions is _____.


(1 point)


disruptive selection





convergent evolution





directional selection





divergent evolution





32. Which combination of characteristics in a population would provide the greatest potential for evolutionary change?


(1 point)


small population, few mutations





small population, many mutations





large population, few mutations





large population, many mutations





33. Most early hominid fossils have been found in _____.


(1 point)


Egypt





France





Africa





North America





34. Which factor may have played a large role in human evolution?


(1 point)


a geologic event that released much radiation into the environment, which in time resulted in an increased mutation rate





climatic changes that caused existing primates to search for new food sources





flooding due to melting glaciers causing primates to seek refuge in the trees





massive grassland fires that caused existing primates to flee to the mountains








Figure 16-4


35. Which characteristic of the skulls in figure 16-4 shows an increase in intelligence?


(1 point)


increased brain cavity size





decreased teeth size





smaller eye sockets





rounder jaw





Short Answer

Help me brought less anwser in?
why are you trying to get us to do your homework for ya? Your not going to learn anything that way.
Reply:21) Crossing Over


22) Gametes (sperm, egg)


23) The dominant trait


24) No Clue


25) ribose sugar and adenine


26) No Clue (cant see figure)


27) No Clue


28) Caused by a recessive allele


29) All of these


30) No Clue


31) No Clue


32) small population, many mutations


33) No Clue


34) climatic changes that caused existing primates to search for new food sources


35) Increased Brain cavity size
Reply:21) Crossing Over


22) Gametes (sperm, egg) i only gave you two answers because you said short answer.
Reply:I%26#039;m calling your mama.
Reply:21.crossing over


22.offspring


23.the dominant trait


24.75% rose comb and 25% single comb


25.deoxyribose sugar and thymine


26.No figure


27.No figure


28.equally common in both sexes


29.PCR


30.No figure.


31.divergent evolution


32.large population, few mutations


33.Africa


34.climatic changes that caused existing primates to search for new food sources


35.no figure





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