Heredity

Question 0

What do the alleles Tt, TT, tt represent?

Answer 0

Tt represents a hybrid. That means it has one tall trait (dominant) and one recessive trait (short). TT is a dominant purebred. This means it is tall (dominant). tt is a recessive purebred because it is short (recessive)

Question 1

What were the results of his F1 and F2 generations? What are the
percents?

Answer 1

In the F1 generation all the plants were tall 100%. In the F2 generation about three fourths were tall and one fourth was short. 75% were tall and 25% percent were short

Question 2

What are organisms traits controlled by?

Answer 2

An organisms traits are controlled by the alleles it inherits from its parents. and it is controlled by our genes

Question 3

What is a Punnett square? What does it represent?

Answer 3

A Punnett square is a chart that shows all the possible ways alleles can combine in a genetic cross. It represents the possible ways alleles can combine in a genetic cross.

Question 4

In a genetic cross, the combination of ___________that parents can pass to an offspring is based on___________

Answer 4

alleles—–probability

Question 5

Name each in as many ways as you can: TT tt Tt

Answer 5

TT Dominant Purebred homozygous allele genotype
tt Recessive Purebred homozygous allele genotype
Tt Dominant Hybrid heterozygous allele genotype

Question 6

Most traits are a result of

Answer 6

complex patterns of inheritence

Question 7

What can influence the way genes are expressed?

Answer 7

environmental factors can influence the way genes are expressed
Examples- tobacco smoke, pollutants can affect gene in a person’s cells in a way that may result in lung cancer and other cancers.

Question 8

What is co-dominance? Give an example

Answer 8

this occurs when both alleles for a gene are expressed equally. For example when a black bunny and a white bunny have offspring the offspring could have white fur with black spots examples- feathers fur

Question 9

What is polygenic inheritance? Give an example.

Answer 9

this occurs when more than one gene affects a trait. example- height, skin color, shades of eye color

Question 10

What is multiple alleles? Give an example.

Answer 10

This is when three or more possible alleles determine the trait example- color of fur in rabbits, wing color

Question 11

Two animals are crossed, one has brown fur and one has white fur. The
offspring have brown and white fur. Explain how this inheritance pattern
occurs.

Answer 11

This inheritance pattern occurs when both alleles are co-dominant

Question 12

What are some examples of traits that have a very broad range of
phenotypes?

Answer 12

hair color, eye color, hand span, height

Question 13

You are very interested in playing a sport, but neither of your parents have ever played a sport?Can you play a sport even though your parents don’t? Is it possible for
you to excel in the sport?

Answer 13

Yes, because it is an aquired trait

Question 14

Give an example of a dominant allele and a recessive allele

Answer 14

T t

Question 15

give an example of a purebred genotype

Answer 15

TT tt

Question 16

give an example of a hybrid genotype

Answer 16

Tt

Question 17

If a _______allele is present, the trait will appear in the offspring

Answer 17

dominant

Question 18

15.) In Mendel’s F 2 Generation, what portion had a trait not seen in the F 1 Generation?

Answer 18

1/4, 1 in 4, 25%

Question 19

14.) You have a genetic cross between 2 hybrid plants with green pods(dominant).What is the probability of producing plants with green pods? Write it in three ways.

Answer 19

3 in 4, 3/4, 75%

Question 20

An organism’s traits are controlled by the ___________ it inherits from its parents. Some are ____________ and some are _________.

Answer 20

alleles, dominant, recessive

Question 21

What did he call the generation after f1. Describe this generation. Use fractions and percents

Answer 21

F2 generation. 3 tall and 1 short
3/4 1/4
3 in 4 1 in 4
75% 25%

Question 22

What did he call the offspring of the P generation Describe this generation. Use fractions and percents.

Answer 22

F1 generation All of the plants were tall

4/4 4 in 4 100%

Question 23

What did he name the Parental generation?

              Describe this generation.

Answer 23

P generation, They were purebred short and purebred tall plants

Question 24

What needs to happen for a recessive form of a trait

    to appear?

Answer 24

In order for a recessive form of a trait to appear, the

         offspring must have two recessive alleles.