that 11. An estra finger in humans is rare but is due to a dominant gene parent
ID: 212974 • Letter: T
Question
that 11. An estra finger in humans is rare but is due to a dominant gene parent has an extra finger but is heterorygous for the trait, what is the normal? d.75% 0% b. 25% c.50% a, 12. Color-blindness is a sex-linked recessive trait. A color blind daughter may be born if the a. b. c. d. Father is normal and the mother is color blind Father is color blind and mother is normal Father is normal and mother is carrier Father is color blind and mother is carrier type in the following ways: 1.3. The relationship of the I and H gene affects the expression of the ABO blood blood type O. This is an genotype HH or Hh: AB produces blood type AB while genotype hh: AB produces example of b. Epistasis c. Codominance d. Incomplete dominance 14. Lethal recessive genes are less common than lethal dominant genes. a. True b. False 15. Albinism in humans is controlled by a single gene. You observe a population of humans where 82% are albino and the rest are normally pigmented. Which allele is recessive? a. Normal pigmentation b. Albino pigmentation c. Neither; alleles are codominant d. There is not enough information to determine which trait is recessive 16. Which of the following is the meaning of the chromosome theory of inheritance as expressed in the early 20h century? a. Individuals inherit particular chromosomes attached to b. Mendelian genes are at speci c. Homologous chromosomes give rise d. No more than a single pair of chromosomes can be found in a healthy normal cell e. Natural selection acts on certain sets of chromosomes rather than on genes genes fic loci on the chromosome and in turn segregate during meiosis to some genes and crossover chromosomes to other genes 17. Two plants are crossed, resulting in offspring with a 3:1 phenotypic ratio for a particular trait. What could this suggest? (select all that apply) a. That the parents were true-breeding for contrasting alleles (eg., RR x rr) b. Both parents are heterozygous for a single trait c. Female parent is heterozygous and the male parent expresses the dominant allele for a single sex- linked trait Both parents are heterozygous for two tightly linked genes with the dominant alleles for both genes being found on the same chromosome d. 8. What cross will result in a 1:2:1 phenotypic ratio in the offspring? a. BB x bb (with incomplete dominance) b. Aa x Aa (with complete dominance) c. Tt x TT (with codominance) d. Yyx Yy (with codominance) e. Ab x Ab (with incomplete dominance)Explanation / Answer
12. The answer is d. Father is color blined and mother is carrier.
Because as females are homozygous for x chromosomes and color blindness is due to x recesseive genes, if the famales have recessieve gene for color blind on both x chromosomes, the femlae will be affected. In the above option the only possibility is d.
13. The answer is b. epistatis.
In epistatis, one gene masks the expression of other gene. As here the recessieve allele at one locus masks the expression of other locus, it is an example for recessieve epistatis.
14. The answer is False.
15. The answer is a. normal pigmentation. Becuase as the dominant allele can expresses her character in both homo and heterozygous in conditions and recessieve allele can express her character in only homozygous in condtions, the freequncy of dominant phenotype is highe in the pouplation when compared with recessieve phenotype. So, the answer is normal pigmentation is recessive.
According to chegg guidelines we have to answer one question at a time.So, post the rest as seperate questions then I can help you.
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