Question

$\large \underline{ \bf{Question1:}}$
• Write two characteristics of metaphase stage.

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$\large \underline{ \bf{Question2:}}$

• A pure grey fur rabbit is crossed with a pure white fur rabbit. In F generation all rabbits produced have grey fur.

a) What is the genotype of F1 generation

b) What is the genotype-phenotype of F1 generation

[Biology]
Chapter:- Genetics​

Answer 1

Explanation:

$\large \underline{ \bf{Answer1:}}$

Metaphase is marked by the arrangement of chromosomes on the equator of spindle.

2-)Chromosome are the shortest thickest in metaphase.

$\large \underline{ \bf{Answer2:}}$

According to the law of dominance, a trait is represented by two contrasting factors of a gene in a heterozygous individual while the homozygous individual carries two copies of same factors. Thus, the genotype of heterozygous rabbit will be Bb and that of homozygous recessive will be bb. Law of segregation states that the two factors for a trait, present together in a heterozygous individual (Bb), do not get mixed and are separated and delivered singly during gametogenesis. Thus, the heterozygous individual produces two types of gametes: 50% gametes with “B” and 50% with “b”. The homozygous recessive individual will make all gametes with “b” allele only.

Answer 2

Answer:

$\large \underline{ \bf{Question1:}}$

1) Write two characteristics of metaphase stage ?

• Metaphase is marked by the arrangement of chromosomes on the equator of spindle.
• Spindle fibre are attracted to the centromere of the chromosomes.

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$\large \underline{ \bf{Question2:}}$

A pure grey fur rabbit is crossed with a pure white fur rabbit. In F generation all rabbits produced have grey fur.

a) What is the genotype of F1 generation ?

Ans) The genotype ratio of generation F1 was 100 percent Ss hybrid, which yielded 100 percent smooth peas since that factor is considered dominant. By self-fertilizing those F1 individuals, Mendel was creating the Ss X Ss cross.

b) What is the genotype-phenotype of F1 generation ?

Ans) The phenotype of this genotype is yellow seed color. yy is the homozygous dominant genotype (2 y alleles). The phenotype of this genotype is green seed color. So, the F1 generation all have identical genotypes, heterozygous at the seed color gene, and their phenotypes are yellow seeds.

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$\qquad\qquad\underline{\textsf{\textbf{ \color{magenta}{Brainly\: Extra\: Shots :-} }}}$

${\large{\bold{\purple{\underline{Genetics :-}}}}}$

• Genetics is the branch of biology concerned with the study of the DNA of organisms, how their DNA manifests as genes, and how those genes are inherited by offspring.