Repeat inheritance with questions

• Biologie
• Middelbare school
• vwo
• Leerjaar 4

In humans widow’s peak (W) is dominant over straight hairline (w). A heterozygous man for this trait marries a woman who is also heterozygous. What is the chance they will have a child with a straight hairline?

1. 0%
2. 12,5%
3. 25%
4. 50%

In humans widow’s peak (W) is dominant over straight hairline (w). A heterozygous man for this trait marries a woman who is also heterozygous. What is the chance they will have a daughter with a straight hairline?

1. 0%
2. 12,5%
3. 25%
4. 50%

Two heterozygotes for a particular condition
produce offspring in the phenotypic ? ratio of
1:2:1. What sort of inheritance does this gene
show

1. There are multiple alleles involved
2. The homozygote recessive is lethal
3. The two alleles show codominance

∙ Dominate allele for black fur in guinea pigs = B
∙ Recessive allele for white fur in guinea pigs =b
∙ Dominate allele for rough fur in guinea pigs =R
∙ Recessive allele for smooth fur in guinea pigs = r
∙ Cross a heterozygous parent (BbRr) with a heterozygous parent (BbRr)

What is the probability of producing guinea pigs with black, rough fur?

1. 1/16
2. 3/16
3. 6/16
4. 9/16

1. autosomal dominant
2. autosomal recessive
3. X-chromosomal dominant
4. X-chromosomal recessive

1. dominant, autosomal
2. recessive, autosomal
3. dominant, sex-linked
4. recessive, sex-linked

Hardy-Weinberg

The frequency of the dominant and recessive alleles in a population will remain constant from generation to generation provided certain conditions are met:

large population

random mating

no mutations

no immigration and emigration

no natural selection

→ Hardy-Weinberg equilibrium

Within a population of butterflies, the color brown (B) is dominant over the color white (b). And, 40% of all butterflies are white. Given this simple information, calculate the following:
The fraction of butterflies in the population that are heterozygous.

1. 0,63
2. 0,37
3. 0,47
4. 0,23