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7th grade life science > Chapter 7 > Flashcards

Flashcards in Chapter 7 Deck (30)
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1
Q

In genetics, a cross is

A

a test to see how traits are inherited

2
Q

An organism is __________ if both its factors for a particular trait are different

A

hybrid

3
Q

According to Mendel, how many factors are there for each inherited trait?

A

two

4
Q

After Mendel published his theories, they were

A

ignored for 35 years

5
Q

If a TT plant is crossed with a tt plant, what will the offspring be?

A

all Tt

6
Q

If a purebred brown hamster mates with a purebred white hamster and all the offspring in the first offspring generation are brown, what would be dominant and/or recessive for the brown and white traits?

A

brown is dominant, and white is recessive

7
Q

Suppose that in dogs long hair is dominant and short hair is recessive. If a hybrid long-haired dog mates with a purebred short-haired dog and twelve puppies are produced, one would expect

A

approximately half of the puppies would have long hair

8
Q

Suppose that in cats brown eyes are dominant and blue eyes are recessive. If a purebred brown-eyed cat mates with a purebred blue-eyed cat and one kitten is produced, one would expect the kitten to have

A

brown eyes

9
Q

A doctor takes an ultrasound by

A

analyzing high-frequency sound waves sent through the mother’s body

10
Q

The genes for sex-linked characteristics are usually carried on

A

the X chromosome

11
Q

The sum of chromosomes normally found in the cells of an organism

A

chromosome number

12
Q

A diagram used to visualize genetic crosses

A

Punnett square

13
Q

the condition in which dominant and recessive genes for a single characteristic are both expressed

A

codominance

14
Q

the only sex chromosome found in human females

A

X chromosome

15
Q

the sex chromosome found in human males but not females

A

Y chromosome

16
Q

two or more genes producing a single trait

A

multiple gene inheritance

17
Q

a picture generated by ultrasound

A

sonogram

18
Q

a characteristic that has a gene on the X chromosome but no corresponding gene on the Y chromosome

A

sex-linked trait

19
Q

a person who has a gene for a particular trait but does not exhibit the trait himself

A

carrier

20
Q

an abnormal trait passed on through genes

A

inherited disorder

21
Q

A(n) _____________ is an organism that has different factors for a particular trait.

A

hybrid

22
Q

What is the normal chromosome number for humans?

A

46

23
Q

A cross between snapdragons with red flowers and snapdragons with white flowers that produces snapdragons with pink flowers is an example of __________ dominance.

A

incomplete

24
Q

The way a plant or animal looks—-its physical characteristics—is called its

A

phenotype

25
Q

Red-green colorblindness is a ________________ trait.

A

sex-linked

26
Q

True or False

Mendel was a Catholic monk.

A

True

27
Q

True or False

Human genetic inheritance does not follow the same genetic rules as inheritance in other organisms

A

False

28
Q

True or False

The chromosome number of an organism is not related to its size.

A

True

29
Q

True or False

The chromosome number is the number of genes on a particular chromosome.

A

False

30
Q

True or False

Skin color, height, and intelligence are each believed to be controlled by single gene inheritance.

A

False