Biology quiz. Help please?
Here are my answers so far (might not be correct), please feel free to correct me if I’m wrong.
True, a, c, False, 75, d, a, a, b, last one I’m clueless on.
Traits governed by polygenic inheritance have genes which interact to produce a bell-shaped curve of phenotypes.
Answer:
True False
Question 2
In an organism, two separate genes influence the length of the hair. The allele for long hair, L, dominates the allele for short hair, l. The allele for hair, H, dominates the hairless allele, h. In the cross between parents of genotype LlHh and llHh, what ratio of phenotypes would you expect to see?
Choose one answer.
a. 4 long haired:3 short haired: 1 no hair
b. 3 long haired:3 short haired:2 no hair
c. 8 long haired:8 short haired
d. 9 long haired:3 short haired:4 no hair
Question 3
Marks: 1
Suppose you have an organism which has the genes for Furry Toes (ft+ or ft), and the gene for Long Nose (ln+ or ln) as well as the gene for Back Woes (bw+ or bw). You suspect that there may be linked genes in the group. A parent which is heterozygous for all 3 genes (Furry Toes, Long Nose, and Back Woes) produces gametes in the following percentages:
ft+ ln+ bw+ 21%
ft+ ln+ bw 21%
ft ln bw+ 21%
ft ln bw 21%
ft+ ln bw+ 4%
ft+ ln bw 4%
ft ln+ bw+ 4%
ft ln+ bw 4%
Which genes are linked?
Choose one answer.
a. Furry toes gene and Long nose genes are linked
b. Back woes gene and Long nose genes are linked
c. None of the genes are linked
d. All of the genes are linked
e. Furry toes gene and Back woes genes are linked
Question 4
Marks: 1
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 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 each of the male and female cubs have normal spots and one each have dark spots.
The mother homozygous for the spot trait.
Answer:
True False
Question 5
Marks: 1
Eye color, in fruit flies, is an X-linked trait. Red eyes are dominant over white eyes. A red-eyed male is crossed with a white-eyed female. What percentage of their offspring will have red eyes?
Enter a number only (0 to 100). No words and no percent symbol.
Answer:
Question 6
Marks: 1
Suppose that gene p is sex-linked, recessive, and lethal. A man marries a woman who is heterozygous (Pp) for this gene. If this couple had many normal children, what would be the predicted sex ratio of these children?
Choose one answer.
a. 1:1 females:males
b. All females
c. All males
d. 2:1 females:males
e. 1:2 females:males
Question 7
Marks: 1
Assume that colorblindness is sex-linked and recessive.
A colorblind man with blood type AB marries a woman with normal vision and blood type A who is heterozygous for both traits. What are the odds of having a daughter that is colorblind and has blood type A?
Choose one answer.
a. 1 in 16
b. 1 in 2
c. 1 in 4
d. 1 in 8
Question 8
Marks: 1
A female who is homozygous recessive for an X-linked trait mates with a male who does not possess the trait. Which prediction is correct?
Choose one answer.
a. Equal numbers of male and female offspring will express the trait.
b. No offspring will express the trait.
c. Only male offspring will express the trait.
d. Only female offspring will express the trait.
Question 9
Marks: 1
Assume that height is a characteristic resulting from polygenic inheritance. The 4 genes that govern this character(R,S,T and U)show incomplete dominance with the capital letter being taller and the lower case being shorter. What is the probability that parents with the genotypes RrSSTtUu and RrSsTtUU will have a child possessing 8 tall alleles ?
Choose one answer.
a. 1/256
b. 1/64
c. 1/128
d. 0
Question 10
Marks: 1
Two homozygous plants are crossed and all offspring are yellow with long stems. A test cross of the offspring produces the following phenotypes:
1,263 yellow, long stem
1,196 white, short stem
205 yellow, short stem
195 white, long stem
How many map unit apart are the genes involved in the cross?
Enter a number only, no words.
Answer:
Some of these answers may not be right so confirm them before you submit
1) True
2) A
3) I have no idea
4) False
5) 50
6) D
7) D
C
9) B
10) 14