What creates variation in the offspring of sexually reproducing organisms?

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1 What creates variation in the offspring of sexually reproducing organisms? 1. genetic recombination during fertilization 2. mitotic division in body cells 62% 3. crossing over in mitosis 4. homologous chromosomes lining up 15% 19% genetic recomb... mitotic divisi... crossing over... homologous chr...

2 Which process allows sexually reproducing organisms to create gametes with half the number of chromosomes of the body cells? 1. mitosis 2. meiosis 3. fertilization 4. reproduction 81% 8% 8% mitosis meiosis fertilization reproduction

3 A branch cut off of a geranium plant grows into a new plant. Will the new plant be different from its parent plant? 1. yes, because mitosis will take place in the new plant. 2. yes, because meiosis will take place in the old plant. 62% 3. no, because meiosis and fertilization did not take place. 4. no, because the new plant was formed from gametes. 15% 19% yes, because m... yes, because m... no, because me... no, because th...

4 Cats have many different possible coat colors. What does this show? 1. mutations occurring in sexually reproducing organisms 85% 2. reproduction in asexually reproducing organisms 3. division of body cells in adult organisms 4. variation in sexually reproducing organisms 8% 0% 8% mutations occu... reproduction i... division of bo... variation in s...

5 What is the result of a single cell going through the process of meiosis? 1. one identical new cell 72% 2. two identical new cells 3. three identical haploid bodies 4. four gamete cells 20% one identical... two identical... three identica... four gamete ce...

6 What is an advantage of asexual 1. the offspring are not identical to their parents 2. the offspring are identical to their parents 3. there are more offspring produced 4. there are fewer offspring produced reproduction? the offspring are not ide... 12% 0% 0% the offspring are identica... there are more offspring... 88% there are fewer offspring...

7 Mendel theorized that genetic traits are segregated during gamete formation and the offspring get only one allele for a trait from each parent. Why is this important to sexually reproducing organisms? 1. They would get too many 80% dominant traits if it did not occur 2. They would get too many recessive traits if it did not occur 3. It allows for offspring to be different from their parents 4. It allows the best traits to be selected out for the offspring. They would get... 12% They would get... 8% It allows for... 0% It allows the...

8 Mendel theorized that genetic traits are independently assorted and one trait does not depend on another for transmission to offspring. What do we know today that makes this theory invalid? 1. Genes on the same chromosome are usually 38% transmitted together. 2. Chromosomes stick together and are often transmitted with each other. 3. The same gene may be responsible for several different traits. 4. Transmission of genes is random and depends on laws of probability Genes on the same chr... 15% Chromosomes stick toge... 15% The same gene may be... Transmission of genes is... 31%

9 Where are genes for sex-linked traits located? 1. They can be on any chromosome 2. On the Y chromosome 3. On the X chromosome 4. On chromosome pair # 21 They can be on... 31% 42% 23% On the Y chr... On the X chr... On chromosome...

10 A white flower crossed with a red flower produces pink offspring. This is an example of incomplete dominance. If two of the pink-flowered plants are crossed, what ratio will the genotypes of the offspring have? 1. 1 RR: 3 Rr 2. 1 RR: 2 Rr: 1rr 3. 2 Rw: 2 Ww 4. 1 Rr: 2 rr: 1 ww 8% 35% 15% 42% 1 RR: 3 Rr 1 RR: 2 Rr: 1r... 2 Rw: 2 Ww 1 Rr: 2 rr: 1...

11 Why are blood types considered an example of codominance? 1. there are four types of blood, not two 2. blood type O can be donated to anyone, AB cannot 3. blood types A and B will both be expressed when present 4. there are three alleles for blood type and four types of blood 56% 20% 16% 8% there are four... blood type O c... blood types A... there are thre...

12 How many pairs of homologous chromosomes do humans have? % 23% 15% 0%

13 If two different alleles are present, which allele is expressed? 1. recessive 2. dominant 3. phenotypic 4. pure 92% 0% recessive dominant phenotypic pure

14 A tall pea plant (DD) and a tall pea plant (Dd) have what in common? 1. phenotype 2. genotype 42% 3. alleles 31% 4. seed color 15% 12% phenotype genotype alleles seed color

15 In crossing homozygous dominant and homozygous recessive pea plants, Mendel noted that some genes were not seen in the F1 generation and were seen in only 25% of the F2 generation. What did he call these genes? 1. dominant 2. recessive 3. lethal 4. incompletely dominant 8% 48% 40% dominant recessive lethal incompletely d...

16 An albino man who married a normally pigmented woman. They have three children: an albino son, a normally pigmented daughter, and a normally pigmented son. A = normal pigmentation, a = albino What is the genotype of the mother? 1. Aa 2. aa 3. AA 4. Cannot be predicted 8 8% Aa aa AA Cannot be pred...

17 What chance does the daughter have of having an albino offspring if she marries a ½ 3. 1/3 4. ¼ AA man? 52% 12% 20% 16% 0 ½ 1/3 ¼

18 What mode of inheritance of the trait shown in the pedigree is most likely? 1. Dominant 2. Recessive 3. Codominant 4. Sex-linked 56% 28% 8% 8% Dominant Recessive Codominant Sex-linked

19 What terms describes individual #1 and #2? 1. Unknowns 2. Recessive 3. Codominants 4. Carriers 60% 20% 16% Unknowns Recessive Codominants Carriers

20 A normal human cell has 46 chromosomes. After a cell undergoes meiosis, how many chromosomes will the resulting cells have? % 40%

21 Which of the following is an example of sexual reproduction? 1. division of an amoeba 2. growth of an organism 3. fertilization of egg by sperm 4. mitosis 100% 0% 0% 0% division of a... growth of an... fertilization... mitosis

22 In which organ of an animal's body would meiosis occur? 1. Liver 80% 2. Testes 3. Heart 4. Ovary 5. Both testes and ovary 0% 0% 16% Liver Testes Heart Ovary Both testes and ovary

23 The following pedigree is for colorblindness. Colorblindness is a recessive sex-linked disease. What is the genotype of Individual #1? X c X c 2. X c Y 3. cc 4. X C Y 6 12% 20% XcXc XcY cc XCY