1)In peas, tall plant height (T) is dominant over short (t). Pure-breeding tall

Question

1)In peas, tall plant height (T) is dominant over short (t). Pure-breeding tall and short plants are crossed. What will be the genotype of the F1 plants (offspring of this cross)?

A. TT

B. Tt

C. tt

D. Tall

E. short

2)In peas, tall plant height (T) is dominant over short (t). Pure-breeding tall and short plants are crossed. If the F1 plants (offspring of this cross) are crossed together, what are the expected phenotypic ratios in the next generation?

A. 3 short : 1 short

B. 1 Tall : 1 Short

C. 3 Tall : 1 short

D. 1 Tall : 2 medium : 1 short

3)The following cross was made between pea plants of known phenotypes but unknown genotypes, with the resulting numbers of each type of progeny indicated. Using the letters T for the tall allele and t for the short allele, give the most probable genotypes for each parent plant. As in the previous problems, the tall allele is dominant to the short allele.

Parents: Tall x Short

Offspring: 88 tall and 90 short

A. TT x tt

B. TT x Tt

C. Tt x Tt

D. Tt x tt

E. tt x tt

4)A breeder wanted to know how black and gray coat color in cats was inherited. The breeder did matings between the F1 black kittens (offspring of crosses between black and gray parent cats), and these matings occasionally produced grey progeny. Can she conclude the mode of inheritance from these results?

5)Certain nematodes (worms) can have either rolling or uncoordinated behavior ascompared to normal "wild type"). The rolling trait is dominant to wild type (non-roller), while uncoordinated behavior is recessive.Geneticists use the symbols R and r for roller and non-roller, and U and u for normal and uncoordinated, respectively. What is the phenotype and genotype of the offspring produced (F1) from a cross between a purebreeding uncoordinated roller and a purebreeding coordinated non-roller? (HINT - If an organism is described as "purebreeding", it is homozygous at all loci.)

A. RrUu that are roller, normal coordination

B. RrUu that are roller, uncoordinated

C. rruu that are uncoordinated

D. RRUU that are roller, normal coordination

E. RRUu that are roller, normal coordination

6)In guinea pigs, dark coat color (C) is dominant over albino (c), and short hair (S) isdominant over long hair (s). The genes for these two traits show independentassortment. What are the most probable genotypes for the parents of the following cross?

Parents: Dark short X Dark short

Offspring: 88 Dark short : 28 Dark Long : 30 Albino short : 9 Albino Long

A. CCSS X CcSs

B. CcSS X ccss

C. CcSs X CcSs

D. CCSS X ccss

E. ccSS X ccss

Explanation / Answer

Q1. A

Q2. C

Q3. D

Q4. In this inheritance the gene responsible for black colour is dominant on the gene responsible for grey colour. Their is a dominant recesive mode of inheritance.

Q5. A

Q6. A

"A malaria biologist"

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

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