Question 3

Question

What do the squares in a pedigree represent?

a
All adults over the age of 18 in a family
b
All the children under age 18 in a family
c
Males in a family
d
Females in a family
Question 4
For sneaky snakes, being rude (R) is dominant to being respectful (r). Complete the cross below, and determine the phenotype (dominant : recessive) ratio.



R r
r #1 #2
r #3 #4
2 (#5) : 2( #6)

Column A
1.
#1:
#1
2.
#2:
#2
3.
#3:
#3
4.
#4:
#4
5.
#5:
#5
6.
#6:
#6
Column B
a.Rr
b.rude
c.sweet
d.respectful
e.rr
f.RR
g.sneaky
Question 5
Premium Photo | Three little orange striped kitten on white background high resolution photoA common trait found in orange tabby cats is the following: being awesome (A) is dominant to being average (a).
A male cat that is homozygous dominant for the A trait is mated with a female cat that is homozygous recessive.
For a cross with four offspring, what is the probability that they will have an offspring who is heterozygous?
out of
Word Bank:
450025100475
Blank 1:
Blank 2:
Question 6
Incomplete dominance is shown in the fruitloop flower, WW are white, RR are red and WR are pink.

Use scratch paper to set up a Punnett square for a cross of the F1 generation (pink flowers).

What is the percentage of pink flowered offspring in the F2 generation of two pink flowering fruitloop plants?

a
100% pink
b
75% pink
c
50% pink
d
25% pink
e
no pink
Question 7
R= red eyes; r= white eyes - parents are a homozygous white eyed female and a red eyed male

In fruit flies, the color of the eyes is sex linked (on the X chromosome). A cross of the flies in the image will produce



a
50% red eyed flies
b
100% of the females with red eyes, 100% of the males with white eyes.
c
0% of the females with white eyes, 50% of the males with white eyes.
d
0% white eyed flies
Question 8
Review is dihybrid cross:



What is the genotype expected in the bottom right-hand corner (red square)

Word Bank:
ggBBGgbbGGBBggBbggbbGGbbGgBb
Blank 1:
Question 9
Clouded leopards are a medium-sized, endangered species of cat, living in the very wet cloud forests of Central America. Assume that the normal spots (XN) are a dominant, sex-linked trait and that dark spots are the recessive counterpart.

Suppose, as a Conservation Biologist, you are involved in a clouded leopard breeding program. One year you cross a male with dark spots and a female with normal spots. She has four cubs and, conveniently, two are male and two female. One male and one female cub have normal spots and one each have dark spots.

What is the genotype of the mother for this sex-linked trait?

a
homozygous
b
purebred for normal spots
c
heterozygous
d
impossible to determine with given information
Question 10
Select all that are disadvantages to sexual reproduction.

a
slower reproduction rate
b
less reliable reproduction
c
does not require fertilization
d
more genetic variation species
e
children different than parents
f
takes time and energy to find mate

Answer 1

Here are the answers for your questions:

Question 3:
What do the squares in a pedigree represent?
c Males in a family.

Question 4:
For sneaky snakes, being rude (R) is dominant to being respectful (r). Complete the cross below, and determine the phenotype (dominant : recessive) ratio.

| | R | r | |---|---|---| | r | Rr (1) | rr (2) | | r | Rr (3) | rr (4) |

The offspring are Rr (rude) and rr (respectful). Each row corresponds to the offspring produced:

1. Rr => Rude
2. rr => Respectful
3. Rr => Rude
4. rr => Respectful

So the phenotype ratio is: 2 (rude) : 2 (respectful)

Thus, Blank 5 = 2 and Blank 6 = 2.

Column A:

1. #1: a. Rr
2. #2: b. rude
3. #3: a. Rr
4. #4: e. rr
5. #5: b. rude
6. #6: d. respectful

Question 5:
A male cat that is homozygous dominant for the A trait (AA) is mated with a female cat that is homozygous recessive (aa). The offspring (all Aa) will be heterozygous. The probability of getting a heterozygous offspring is:

• From the cross:
  • Aa (4 offspring)
• So, the probability is 4 out of 4 or simplifies to 1 out of 1.

Blank 1: 1
Blank 2: 1

Question 6:
To determine the percentage of pink flowered offspring in the F2 generation of two pink flowering fruitloop plants (WR x WR):

| | W | R | |---|---|---| | W | WW (25%) | WR (50%) | | R | WR (50%) | RR (25%) |

In this case:

• WW (white) = 25%
• WR (pink) = 50%
• RR (red) = 25%

The total percentage for pink (WR) are from 2 squares:
50% pink (from WRs two entries) + 0% (from WW and RR)
So in total, Pink = 50%.

The answer is c. 50% pink.

Question 7:
In the cross of a homozygous white-eyed female (XrXr) with a red-eyed male (XRY), the possible genotypes will be:

• Female offspring: XrX (all will have white eyes).
• Male offspring: XRY (all will have red eyes).

Hence, the right answer is: b. 100% of the females with red eyes, 100% of the males with white eyes.

Question 8:
For a dihybrid cross, the expected genotype in the bottom right-hand corner (red square):

• The possible genotypes depend on the specific plants being crossed. A dihybrid cross results in a 9:3:3:1 ratio.
• If we assume BbGg is the cross, which gives us 1/16 GGbb.

Blank 1: ggbb.

Question 9:
For clouded leopards, since one cub has normal spots (indicating at least one XN), and the other has dark spots (indicating it has the genotype for dark spots), we can determine the mother's genotype:

• The mother could be either homozygous (XN XN) or heterozygous (XN Xn).

However, since there are cubs with dark spots (Xn Y), we can confirm that the mother must be at least heterozygous. Thus, c. heterozygous is the correct answer.

Question 10:
Disadvantages to sexual reproduction include:

• a. slower reproduction rate
• b. less reliable reproduction
• f. takes time and energy to find mate

Correct answers are a, b, and f.

I hope this helps with your understanding of these genetic concepts!