biology 1 lab final Flashcards


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1

Which of the following disorders is a result of aneuploidy?

Klinefelters syndrome

2

Monohybrid cross: An organism that is homozygous recessive for a trait is crossed with a known heterozygote. What is the probability of getting an offspring that is homozygous recessive?

50%

3

Define aneuploidy.

an abnormal number of chromosomes (one more or one less)

4

Dihybrid cross: Black fur in mice (B) is dominant to brown fur (b). The short tail trait (T) is dominant to long tails (t). What proportion of the progeny of the cross BbTt x BBtt will have black fur and long tails?

50%

5

In cattle, roan coat color (mixed red and white hairs) occurs in the heterzygous (RW) of red (RR) and white (WW) homozygotes. The polled (hornless) gene (H) is dominant to the horned (h) gene. What proportion of roan polled cattle would you expect from a RWhhx WWHH cross?

100%

6

In a dihybrid cross where the P generation included one parent that was homozygous dominant for both traits (red, axial flowers), and one parent that was homozygous recessive for both traits (white terminal flowers), what would be the expected proportions of the following phenotypes among the F 2 generation?

r

9 red axial: 3 red terminal: 3 white axial: 1 white terminal

7

Snapdragons can have red, white, or pink flowers. Red flowers are the result of a homzygous genotype for red; white flowers result when the organism is homozygous for white; and pink is the result of a heterozygous genotype (one red gene and one white gene). This type of inheritance, where the heterozygote is intermediate in phenotype between the two homozygotes is known as:

incomplete dominance

8

What is the karyotype for Turners syndrome?

monosomy of the X chromosome

9

Which of the following males would have one or more Barr bodies?

Klinefelters syndrome

10

What is the karyotype for Turners syndrome?

monosomy of the X chromosome

11

Cystic fibrosis is inherited as an autosomal recessive. A couple who are both carriers for the gene for cystic fibrosis, have two children who have cystic fibrosis. What is the probability that their next child will be normal?

75%

12

Monohybrid cross: An organism that is homozygous recessive for a trait is crossed with a known heterozygote. What is the probability of getting an offspring that is homozygous recessive?

50%