please help me with these bes are recessive to free ear when an individual with

Question

please help me with these

bes are recessive to free ear when an individual with attached earlobes mates bes rozygous for free earlobes? with vidual B) 0% C) 75% genotype of an individual who is heterozygous for dimples is a trait controlled by a single gene What is the dd Which of these crosses will produce only heterozygous offspring? B) Aa x C) AA x aa D) AA Aa 46) A couple has two female children. What is the probability that next child will be male? A) 33% their B) 25% 46 D) 50% 47 The is most commonly found in nature. A) wild-type tra B) dominant trait D) parental type C) recessive trait 48) An individual with (naturally) curly and an individual wi naturally) straight hair mate; a 48) hai r of their offspring have (naturally) wavy hair. Wha is the relationship between the alleles for hair texture? A) incomplete dominance B) codominance C) wavy hair dominant to both straight and curly hair D) pleiotropy 49) An individual with the blood group genotype LMLN has the phenotype MN. What is the relationship between the LM and LN alleles? A) pleiotropy B) codominance D) LN is dominant C) incomplete dominance 50) In humans, the inheritance of is best explained as being polygenic B) sickle-cell disease A) cystic fibrosis D) blood type C) heigh 51) Many human traits, such as our performance on intelligence tests or our susceptibility to heart 51) disease, are A) determined by genes in some people and by the environment in other people B) influenced by both genes and the environment C) determined only by our genes D) not affected by our genes 52) Red-green color blindness is inherited as a sex-linked recessive trait. The gene is found on the x 52) chromosome. Can a man with normal color vision father a daughter who is red-green color-blind? A) Yes, if the woman with whom he mates is red-green color-b B) No, he can't unless there is a mutation) C) No, the expression of the trait skips a generation D) Yes, if the man is heterozygous for red-green color blindness.

Explanation / Answer

43) A.Genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes is 1:1 according to test cross. so probability is 50%.

44) C In humans, the presence or absence of dimples is a trait controlled by a single gene which is D,D is dominant trait over d which is recessive.

45) C Cross between AA and aa ,which always produce Aa heterozygous offsprings.

parent generation AA X aa

gametes A , A a , a

offsprings Aa , Aa , Aa and Aa.

46) D .A couple who has two female children. The probability that their next child will be male is 50%.

47) A . The wild type is the trait most commonly found in nature.Wild type is the phenotype of the typical form of a species,which occurs in nature.

48) A . An individual with (naturally curly hair and an individual with (naturally) straight hair mate, all of their offspring have (naturally) wavy hair.Relationship between the allele for hair texture is incomplete dominance.

49) B . An individual with the blood group genotype LMLN has the phenotype MN. The relationship between the LM and LN alleles is codominance.Codominance is a form of dominance where in the alleles of a gene pair in a heterozygote are fully expressed. This results in offspring with a phenotype that is neither dominant nor recessive.

50) C.In humans the inheritance of height would be polygenic.Polygenic inheritance occurs when one characteristic is controlled by two or more genes. Examples of human polygenic inheritance are height, skin color, eye color and weight.

51) B. Many human traits, such as our performance on intelligence tests or our susceptibility to heart disease, are influenced by both genes and the environment.

52) B. He can't (unless there is a mutation).A man with normal color vision cannot father a daughter who is red-green color blind.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.