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Genetics Suppose that the wild type phenotype for apples is yellow, short fruit with large leaves and that a strain of mutant apples has red, round fruit with small leaves. A and a represent the alleles for fruit color, B and b represent the alleles for fruit shape, and C and c the leaf shape. Two apples with the genotypes, Aa Bb cc and Aa Bb CC, are crossed. The resulting Punnett square is shown below. One square has been completed with the correct apple phenotype. Fill in the rest of the Punnett square by placing a fruit and leaf phenotype in each square.

ABc

Abc

aBc

abc

ABC

 yellow, tall fruit, large leaves

AbC

aBC

abC

What are the modes of inheritance for each trait in the mutant strain of apples?

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Tod Thiel
Tod ThielLv2
28 Sep 2019

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Related questions

I am somewhat new to this site although I am a member, so I havethese questions I have answerd most of them my self yet I wouldlike to see if any experts, or people with some knowledge couldcould go ahead and do them so i can see if I am correct or not. Idont actually expect anybody to be able to make a punnet square, asI myself had to make my punnet squares on paper. But these are thequestions below, I will put my answers the ones I have gotten in () but if you are either able to tell me if im correct or if notshow me some sort of steps to becoming correct? Thanks ZackCross.

Solve all of these problems using a Punnett Square. ( I Havedone this mostly on paper)

In certain bacteria, an oval shape (A) is dominant over round(a) and thick cell walls (B) are dominant over thin (b). A bacteriaheterozygous for both oval shape and a thick cellwall was crossed with a round bacteria with a thin cell wall.Describe the phenotype of the offspring.

(My answer not sure if correct but I got : Oval Thick wall: Oval Thin wall : Round thick wall: Round thin wall

1:1:1:1)

2. The ability to roll the tongue sideways (A) is dominant overthe inability to roll one's tongue (a). In humans, non-attachedearlobes (B) are dominant over attached earlobes (b). Two parentswith attached earlobes can roll their tongues. They are bothheterozygous for the tongue rolling trait.

  1. What is the genotype of the mother? ( I got Bb Aa)
  2. What is the genotype of the father? ( I got Bb Aa)
  3. What are the possible gametes from the mother? ( I gotBA Ba Ab ab)
  4. What are the possible gametes from the father? ( I got BA Ba Abab)
  5. Draw the Punnett square, and combine the gametes to produceoffspring( I did on paper)
  6. What is the phenotypic ratio of these offspring? (Didn'tunderstand?)

  1. A man heterozygous for non-attached earlobes can roll histongue. A woman with attached earlobes can roll her tongue. Assumeboth are heterozygous for the tongue-rolling trait.
    1. What is the genotype of the mother?
    2. What is the genotype of the father?
    3. What are the possible gametes from the mother?
    4. What are the possible gametes from the father?
    5. Draw the Punnett square, and combine the gametes to produceoffspring
    6. What is the phenotypic ratio of these offspring?

  2. In summer squash, white fruit color (W) is dominant over yellowfruit color (w) and disk-shaped fruit (D) is dominant oversphere-shaped fruit (d). If a squash plant purebreeding for whiteand purebreeding for disk-shaped fruit is crossed with a plantpurebreeding for yellow, sphere-shaped fruit, what will thephenotypic and genotypic ratios be for:
    1. the F1 generation?
    2. the F2 generation?

Any Help would be greatly apretiated I don't understand how thepoint system works but I did purchase the membership package thingso I do believe I will be able to award someone with these karmapoints which I purchased.

1. Ifa species of flower has the allele R (red) which is incompletelydominant to the allele r (white) what color is the genotype of anindividual with a red flower? Choose as many as areappropriate. (Points: 2) RR
Rr
rr
R
r

2. A gene can be defined as... (Points :2)
alternateforms of the DNA for a trait
geneticcombination that determines the observable form of a trait
partof the DNA that codes for a specific protein
theobservable form of a trait

3. A homozygote is an individual in which(Points : 2)
allelesof the gene pair are different
allelesof the gene pair are identical
genesare homolgous
traitsare passed from parents to progeny

4. Which of the following might be aphenotype? (Points : 2)
A
Aa
pinkflowers
AaDd

5. What does "F2 generation" refer to? (Points: 2)
theparents
theoffspring of the parental generation
theoffspring of crossing the F1 generation with itself
theoffspring of crossing the F1 generation with the parentalgeneration

6. Which of the following genotypes isheterozygous? (Points : 2)
Aa
AABB
A
a

7. Which statement best describes a dominantallele? (Points : 2)
theallele expressed in the homozygote
theallele expressed in the heterozygote
theallele that is most common in the population
theallele that is lethal

8. In a monohybrid cross, if genotype AA iscrossed with genotype aa what will the ratio of genotypes be?(Points : 2)
0AA:1 Aa:0 aa
1AA:2 Aa:1 aa
1AA: 1 aa
1AA:1 Aa:1 aa

9. Leaf color is controlled by 2 alleles whereA (green) is dominant to a (yellow). Leaf shape is controlled by 2alleles where B (round) is dominant to b (heart-shaped). If oneparent's genotype is AABB what is its phenotype? (Points : 2)
green,round leaves
green,heart-shaped leaves
yellow,round leaves
yellow,heart-shaped leaves

10. Leaf color is controlled by 2 alleleswhere A (green) is dominant to a (yellow). Leaf shape is controlledby 2 alleles where B (round) is dominant to b (heart-shaped). Ifthe genotype AaBb is crossed with the genotype AaBb what will theratio of phenotypes be? (Points : 3)
1green, round: 1 green, heart: 1 yellow, round: 1 yellow,heart
1green, round: 2 green , heart: 2 yellow, round: 1 yellow,heart
9green, round: 3 green, heart: 3 yellow, round: 1 yellow,heart
9AABB: 3 Aabb: 3 aaBb: 1 aabb

Q 1 – Manx cats are produced when a dominant allele is inherited for the Manx gene (M). Inheritance of two dominant alleles, however, results in death of the fetus. Coat color in cats is determined by two alleles with incomplete dominance. BB produces black colored cats, Bb produces grey cats, and bb produces white cats. A grey Manx cat is mated with a white Manx. What proportion of the living offspring will be white Manx kittens? (3 points)

Q 2 – In goats, a beard is produced by an autosomal allele that is dominant in males and recessive in females. We’ll use the symbol Bb for the beard allele and B+ for the beardless allele. Another independently assorting autosomal allele that produces a black coat (W) is dominant over the allele for white coat (w). Give the phenotypes and their proportions expected for the following cross: B+B+Ww male × BbBbWw female (2 points)

Q 3 – E. W. Lindstrom crossed two corn plants with green seedlings and obtained the following progeny: 3583 green seedlings, 853 virescent-white seedlings, and 260 yellow seedlings.

Give the genotypes for the green, virescent-white, and yellow seedlings

Explain how color is determined in these seedlings (which genotype gives which phenotype). (3 points)

Q 4 – You are studying a gene that controls ossicone (horn) length in giraffes. The wild-type long-ossicone allele (L) is dominant to the mutant short-ossicone (l) allele. However the L allele is only 60% penetrant in both homozygotes and heterozygotes. In a population of 212 giraffes in an African nature preserve, 80 giraffes are either homozygous or heterozygous for the long ossicone allele (L). What proportion of offspring would you expect to exhibit the long ossicone phenotype? (2 points)

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