Question

Help!

Answer 1

1.

In a monohybrid cross, if the gene for tall (T) plants was incompletely dominant over the gene for short (t) plants, what would be the predicted result of crossing an intermediate (Tt) plant with a short (tt) plant? (Hint: You may want to complete a Punnett square)

25 percent tall, 50 percent intermediate, 25 percent short

75 percent intermediate, 25 percent short

100 percent intermediate

50 percent intermediate, 50 percent short

2.

A cat is blinded in one eye in a fight. When this cat later sexually reproduces with another cat, how will the blindness affect the offspring?

All of the offspring will be blind because blindness is a dominant trait.

Some of the offspring will be blind, if the blind cat passes on the allele for blindness.

Most of the offspring will be blind if the other parent cat carries the same allele for blindness.

None of the offspring will inherit blindness from this cat, because it is not a genetic trait.



3.
If a pea plant has a genotype SSTt, what are the possible genetic combinations that could be present in a single grain of pollen produced by the plant?

SS, Tt, ST

ST, St, st

SS, Tt, ST, St

ST, St




4.
The allele for a widow’s peak has complete dominance over the allele for a straight hairline (w). What is the probability of two parents heterozygous for a widow’s peak (Ww) having an offspring with a widow’s peak?

75 percent

50 percent

0 percent

25 percent



5.
If a boy exhibits a sex-linked trait that is carried on the X chromosome, what must be true?

His mother exhibited that trait.

His father exhibited that trait.

His father’s mother carried an allele for that trait.

His mother carried at least one allele for that trait.


6.

Which of the following genotypes is homozygous dominant?

tt

Ff

XY

SS

7.

In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. If two red-eyed heterozygous flies (Rr) mate together, what are the possible genotypes of their offspring? (Hint: You many want to complete a Punnett square.)

RR and Rr

Rr only

RR and rr

RR, Rr, and rr




8.
In guinea pigs, dark hair (D) is dominant over light hair (d) and curly hair (C) is dominant over smooth hair (c). Complete a dihybrid cross for parents with the genotypes: DdCc × DdCc and answer the following in complete sentences.

Describe how you would set up a Punnett square for this cross.
List the likelihood of each possible offspring genotype.
List the likelihood of each possible offspring phenotype.

Answer 2

Try to google it!! :D

Answer 3

lol or try to read your book and solve it yourself.