bio finals formatives - unit 7

Aa

Suppose a white flower crossed with a homozygous purple flower. What are the possible genotype(s) of their offspring?

all purple

Suppose a white flower crossed with a homozygous purple flower. What are the possible phenotype(s) of their offspring?

25%

Suppose two heterozygous flowers crossed. What is the probability that they will produce white flowers? (Do a Punnett Square to check).

50%

Suppose a heterozygous flower and a homozygous white flower were crossed. What is the probability that they will produce purple flowers? (Do a Punnett Square to check).

100%

If a blue fish mates with a yellow fish, what are the chances (probability) of having offspring with green scales? (Do a Punnett Square to check).

50%

If a blue fish mates with a green fish, what are the chances (probability) of having offspring with green scales? (Do a Punnett Square to check).

50%

If a black feathered chicken mates with a spotted chicken, what are the chances (probability) of having offspring with pure black feathers? (Do a Punnett Square to check).

0%

If a black feathered chicken mates with a spotted chicken, what are the chances (probability) of having offspring with pure yellow feathers? (Do a Punnett Square to check).

A segment of DNA coding for a trait

What is a gene?

Different forms of a gene

What defines an allele?

A distinguishing characteristic of an organism

What is a trait?

Genes determine traits expressed in organisms

How do genes relate to traits?

Alleles separate during gamete formation.

What is Mendel's law of segregation?

Genes sort independently during gamete formation.

What does the law of independent assortment state?

A parent passes one allele to offspring for a trait.

What demonstrates the law of segregation?

Two identical alleles for a trait.

What does homozygous mean in Mendelian genetics?

Heterozygous

Which term describes one dominant and one recessive allele?

The genetic makeup of an organism.

What does 'genotype' refer to in genetics?

flower color in plants

example of a phenotype

Genotype influences phenotype expression.

What is the relationship between genotype and phenotype?

Inheritance involving more than two alleles for a trait.

What is multiple allele inheritance?

Inheritance involving more than one gene controlling the expression of a trait.

What is polygenic inheritance?

Males have only one X chromosome, so they express any recessive allele they inherit.

Why are males more likely than females to express recessive X-linked traits?

All the female offspring and half the male offspring will have red eyes.

In fruit flies, the gene for eye color is on the X chromosome. The allele for red eyes is dominant to the allele for white eyes. A researcher crosses a heterozygous red-eyed female fly (XRXr) with a red-eyed male fly (XRY).Which of the following statements describes the expected outcome of the cross? Do a Punnett Square to check.